Bella was expecting to be slightly late to math class. This is not math class, but it seems like the sort of thing she ought to be later to math class in order to investigate. In she stalks, ready for something to jump out at her, wondering if she ought to pull a stake out of her bag.
"Okay," she says, "innocent bystander, witch, demon, other?" Her hand hovers near her bag. "If you tell me innocent bystander and it turns out you're not I will be irritated."
She looks like a shorter, shorter-haired, heirloom version of Linyabel, dressed in fantastically outdated Earth fashion and a ponytail.
There is a certain unworried cast to his posture that might be faintly familiar. It is the stance of someone who recognizes that Bella is about to pull a weapon and isn't especially concerned about what will happen if she does.
"Rather not stagger late into math class with someone's blood all over me, especially if yours is red and I can't pass it off as a disaster in the art room. My question could be rephrased as: are you a human, and did you do," she gestures at the bar, "this thing?"
"Right," says Mark. "See, I didn't grow up Mark. I grew up Miles - called by his name and made to study every available datum on his life. It inspired a certain kinship, the first time I read those stories - the process of extrapolating from limited information was very familiar to me. I even snuck out to the museum once."
"She was on the planet when my creator went ahead with the substitution plan. I did a flawless Miles, right up until she picked me up and kissed me, and then the obvious flinch reaction gave me away and I had to stun her and drag her off. I particularly wanted to talk to Miles alone before they had him killed, but since she was there too, I arranged a private conversation with her after the one I had with him. She didn't take it nearly as well. They're all alive and free now, by the way, don't be alarmed."
"I do not. Anyway, if you didn't replace my math class with a time traveling bar, I don't know how it happened, and it could be unfriendly. For instance, if I've been flung forward into the thirtieth century, there may have been a missing Slayer problem for the last millennium, although if you don't have vampires that suggests something else is going on." She looks around at the utterly innocuous furniture. "Interesting wall display," she says of the window with the exploding stars.
Bella drifts near the bar. A napkin appears. She has a stake in her hand in the blink of an eye, and nothing to stab with it.
Another napkin appears.
The first one says, Hello, can I interest you in a beverage? First one is free.
The second napkin says, Please don't be alarmed, I'm not going to attack you. In fact, violence is strictly prohibited in my immediate environs.
"Huh. And why are we here?"
I don't control the door or communicate directly with whoever does. But if you prefer to leave, you will find yourselves in the same times and places you left, respectively.
"So right now back home time is paused - and if I walk out the door, and close it, and open it again, math class?"
Correct.
"And you don't know why us, why our respective 'now's... Do you know whether this is time travel or alternate universes?"
Alternate universes.
Bar is it, thank you. And for reference I am a she.
"Good to know. Aaaaand is all this business magic?"
It is, yes. But not of the sort of world-specific kind you're accustomed to.
"Riiiight."
There are security staff, who turn up when there is a problem. Whatever mechanism controls the door arranges for the security staff to have the ability to subdue whatever patrons they coexist with.
"So right now in a security office somewhere there is someone who can beat up the Slayer and will do it if I take it into my head to do violence."
Yes. Although as a matter of general habit I do not announce who it is on my own recognizance.
"I doubt I'd recognize the name anyway."
If you are very much inclined to do violence, it is not prohibited in the backyard.
"Noted. I'm not nearly as trigger-happy as I seem, by the by."
I wasn't going to mention it.
"I know a vast number of ways to efficiently kill people under almost any conceivable circumstance, and comparatively few ways to do less," says Mark. "By my best estimate, you are not tough enough to survive everything I could do even without sharp objects. And I don't want to kill you. So I will try not to kill you."
"I will assume that you decided to spar with the Slayer with the understanding that this may be hazardous to your health. I think I'll reserve judgment on whether you have it coming," she says, and she downs the rest of her Orange Julius and heads out the back door.
"Hmm... it's moderately agonizing to be unable to express myself genuinely without horrifying people," he says. "This is probably the longest friendly conversation I've had while not actively pretending to be someone I'm not since... well, since I had Miles tied to a chair."
"Hmm... I sit near a stranger on the tubeway. I mention that I liked the book he is reading. He indicates it's an old favourite of his and asks what my favourite part was. I recognize that mentioning the torture scene would probably be a bad idea, so I say it was the final battle. He asks why. I say triumphing over the forces of darkness is always more fun when it involves setting most of a continent on fire. He looks deeply uncomfortable. I find another seat."
"In the example you gave probably the safe thing is 'don't answer, find out what the other person's favorite part was instead' - but then it just branches further from there so that kind of thing is very short term - and I'm not actually remotely qualified to teach remedial social skills, sorry."
"If you are, or know, some kind of engineering genius, I could tell you things like my broad understanding of the physical principles behind a plasma arc. That's a weapon that fires bolts of plasma. Good for setting things extremely on fire. But I know I couldn't build one in a centuries-old garage."
I can produce most harmless nonmagical medium-sized nonliving objects.
"...such as the copy of Vanity Fair with Tony Stark on it?"
Do you want to borrow or buy it?
"Borrow will do."
And here is a copy of Vanity Fair with Tony Stark on the cover.
"This is what Tony looked like - I suppose it's loosely possible that this is actually a picture of Sherlock if he judged this photo shoot to be a high assassination risk for some reason, but this is Tony body language rather than Sherlock body language anyhow. If you were curious."
"But I haven't seen him do it, not in person. Tony was extremely famous, hence the magazine cover, and Sherlock impersonated him undetected a few times that I know of, so he must have done a pretty good impression - the accent and the," she gestures at the magazine, "characteristic smile, bare minimum, but I haven't seen it."
"Best known for inventing a moderately revolutionary computing device called a holo-pen. Very fond of her husband. She scoops him up. It's very cute, unless, for example, you are trying to impersonate him at the time and have a previously undiscovered paralyzing fear of affectionate physical contact."
"Well, isn't that just ducky." Pause. "I might be able to get ahold of my Watcher from where my door is, and get him to go wake up and transport Sherlock, if you want to meet him, but it'd be risky and I'd like to leave it to when I'm about ready to head out of the magic bar."
Reasonably. If you are never going to return to your home world, or will only do so should conditions requiring the passage of time there be met, then time will pass.
"Does resolving not to leave until Giles hauls Sherlock here count?"
It is unlikely that merely resolving to stay put will meet the conditions.
"Damn. Well, the crypt isn't that far away."
"Hey, Bar, you apparently see multiple-worlds shenanigans all the time -"
Yes?
"Are things like me looking like his sister-in-law and him talking like my boyfriend common?"
Reasonably so, yes. I can't verify what's going on in those particular situations without seeing the missing parties, but there are plenty of cases of people having alternate universe variants.
"Innnnteresting."
"Yeah. Um, my Watcher is way more easily ruffled than I am and I don't relish seeing him ruffled except when I do, are you gonna be reasonably non-ruffly if I write on my paper airplane 'hey come to the math room' instead of just 'please fetch me Sherlock'?"
It reads, Magic where there is usually a math room, check it out.
Bella waves him in. "Hi, Giles. This is a magic time-pausing bar called Milliways. I've been in here for a couple hours. That guy is named Mark and he is from the thirtieth century in an alternate universe, and the bar is sapient and conjures up beverages and copies of Vanity Fair out of nothing while channeling Miss Manners into neatly handwritten napkins."
"Also we sparred - me and Mark, not me and Bar - and in that as well as other ways he occasionally reminds me of Sherlock. The door will disappear if there is nobody from our world behind it and it closes. I am hoping I can send you on an errand to Sherlock's to wake him up, put him under something opaque, and bring him over to meet Mark. And since the door's closure pauses time I will require a faculty note excusing me from math and allowing me to loiter on the floor outside the door holding it slightly ajar but not enough that anyone will notice what's behind it."
"He's an interesting challenge! Most things I fight, if I set them up so they can do six things and the first five are instantly fatal, they'll do the sixth thing, and I can use that to maneuver. Sherlock often does a seventh thing. And Mark occasionally picks one of the first five in a way that manages to not be instantly fatal."
"Where my math classroom was supposed to be, I found a door to an alternate universe, which Giles is currently holding lest it disappear. It contains a fellow from yet another alternate universe who is from a thirtieth century void of supernatural this-and-that and who also appears to be a personality cross between you and an insane midget, but please don't tell him I summarized him that way. I thought you might want to meet him."
"I fought him. He's good, he got the first possibly-lethal hit on me, and the third one too. You are of course welcome to do the same as long as you have the 'one of you is a vampire and the other is a trained assassin' safety lecture first. I might want to have a more detailed conversation about your other activity that starts with F. He's not a straight-up duplicate, he doesn't look anything like you and occasionally he is heavier on the insane midget bit. And if you determine to the best of your considerable ability that he'd be more entertained than insulted by it you can pass on the phrase."
"Hrm. On reflection," she says, running a yellow light, "I can probably cunningly use my powers of self-hacking to avoid being upset by you going around performing actions brought to us by the letter F, and I would particularly feel like a jerk if you found an alternate universe Tony and I got in your way - Mark, the insane midget, predicted that one, by the by - but would probably feel more generally threatened by non-Tony entanglements that had high ratios of emotional affair to fornication. Aaaand would feel extremely awkward if you picked up, say, a demon that I later felt obliged to kill."
"If you want to go out and let the door close, Giles, you will have to do exactly zero waiting should something that might interest you come up and cause me to lean out and tap you on the shoulder. Remain at your own risk to the cleanliness of your glasses."
A couple of hours later, Sherlock returns. He looks pretty well beat up, but all parts appear to be in good working condition.
"Mark is sleeping off non-fatal blood loss," he reports. "I wouldn't swear he couldn't have killed me if we'd been trying in earnest. I am very impressed. Also, he wants me to turn him."
"I lack the diagnostic tools to tell if he has a soul, but the parts of him that are me are me," he says. "Very much congruent with the soul-free version. I genuinely do not know what would happen. Except that if he turned out to need killing we would all be very doomed. Which is a large part of the reason I haven't done it."
"Sunlight, crosses, holy water, invitations to dwellings, dietary requirements, it's not exactly a convenient no-strings upgrade. Also, he does not have a me at home, except insofar as his sister-in-law who he's ambivalent about ever seeing again counts, to inspire him to not eat people."
"People exist in a vast abundance and frequently get in his way such that killing or harming them would be a viable solution, and yet he does not," says Sherlock. "He has killed one person and I can imagine few ways in which that murder would not have been ethically justified."
"Yep. She's only published papers on the neurology thing, but I found a press piece about her revolutionary little computing gadget and it had some biographical information on her other hobbies. She's genetically engineered for various things including spectacular levels of intelligence. Oh, and she speaks twenty-five languages as of whenever the article came out. Gives a lot of money to useful charities. Very well-traveled. I kind of want to meet her right away, and I also kind of want to run off and accomplish a century's worth of shit first."
"But there's still a magic bar! Who is very good about recommending reading material. And Orange Juliuses. I asked and she can also do blood which is both tasty and also no-people-were-harmed-in-the-process, not that you need that sorted particularly urgently."
Bella flips through the material Bar supplied on Linyabel. She finds the article with the photograph. "Apparently," she says, "this is what I'd look like if I was heavily genetically engineered. And didn't need to dress for practicality and was a Space Noblewoman."
Some, but possibly not anything you're equipped to use.
"Mmm - I don't know, can I borrow a computer with copies of the 2020 Wikipedia on it?"
I'd really have to know a specific world from which to draw such a thing.
"Does Mark's work?"
In Marks's world Wikipedia ceased to exist in 2015. And I caution you that there may be slight differences in the laws of physics due to wormholes, and there is also no record of the existence of, for example, a Tony Stark, which may have actually impeded technological development on the cutting edge.
"...Damn. Uuuuum."
Without directly commenting on the plagiarism aspect, I can find works of fiction like that which sold well circa your year in Mark's world and supply copies, but can of course not guarantee that you will find the publication process easy, especially for books you did not in fact write.
"...Point. Okay, that's a back-burner idea..."