Yup! Three - no, four doors in the walls, one labeled EMERGENCY STAIRS and others not labeled.

Do any of them have windows in the walls suggesting that they lead outside.

Well, if there were windows, there would be light, so... no? Probably some of the doors lead outside!

It might be nighttime! But she'll tug Xander along and start trying some doors.

Supply closet, bathroom, there's some light visible through that one!

What else is visible besides light?

More doors, a left turn, and a window right where it turns left with the blinds down.

And past the blinds?

Chicago! They're on the second floor of a red-brick building, it looks like, and not a very interesting building; red brick, mostly, greatly resembling the other buildings next to it. There's a street below, but she doesn't see any cars on the street; in the distance she can hear them, though, now that she's close to a window. Overall it looks... not too different from a not-very-interesting street in her home universe?

"You wanna try the window?" she asks Alex.

"I don't really want to try the window! We could just wait for the other magical girl!"

"I'd catch you," she says, but they don't argue about it; they make their way back to where the other magical girl would be expecting them.

"Hi!" Mirror doesn't take long to make it back. She looks slightly scorched. "Good work finding some light! If a tinker supervillain ever tells you he 'doesn't do robots', by the way, he is a dirty rotten liar."

She gives Mystery Girl a second look. Just what does her costume look like, in the bad light available to them now?

Isabella's costume:

- big red and blue wings, like a crimson rosella but neatened-up markings and color grading
- drapey red and blue outfit, layers of very thin fabric decorated in various subtle ways with designs of rings in many sizes, clustered in places where the fabric gathers and spread out where it does
- magazine-cover-perfect makeup on a magazine-cover-perfect face with perfectly-behaved brown hair gathered into a braid that should have taken six hours for a professional
- heavily circle-themed jewelry, in black and white metals with red jasper and sodalite - necklace, earrings, stacks of bracelets, two rings on each hand, a few things stuck to the corners of her eyes, various ornaments poked into her hair in a manner that indicates they have no structural importance
- nail polish that matches all the red jasper

That is literally the most complicated superhero costume Mirror has ever seen, and also creepily perfect human beauty, huh, if this girl isn't a construct she's probably an Idealist What Fun. "Nice costume! That trick with his gun was you?"

(Mirror's own outfit is a tradeoff between 'what is practical to afford and maintain without Ulysses glowering too often', 'what provides basic armor without being heavy enough to slow me down too much', and 'what looks like the person wearing it is an Ideal Hero instead of a Grim And Gritty Anti-Hero'; it is fairly tight and blue and white and shiny and armored over the torso and a little else where it doesn't disrupt mobility and basically nowhere else because that would make it too heavy, and although a good deal of it is bright blue spandex, Isabella can see a few places where it's been patched or where part of the very light armor has been replaced and part hasn't.)

"Thanks," says Xander, about the costume.

"Yes," says Isabella, now squinting at the imperfections in Mirror's outfit. Some people make pants work, some people make minimalism work, it's not ridiculous someone could be doing both... but visible repairs? Weird.

(She can't see much of Mirror's face under the mask, but neither her face nor her hair looks more than 'moderately pretty', either. If she's being cast in a movie, it's as 'girl next door', not as 'stunning beauty', and she's not likely to be cast in a movie.)

"Thanks! You totally get the credit for beating him; wide-area force-field plus death-ray-that-can-shoot-through-my-power is a combination that I am not great at coping with. I've called the cops, incidentally, so that's taken care of."

"I'm Mirror." Not the best name to go with her power, but it's a family tradition. "Should I ask who you two are?"

"I'm Isabella and this is my brother Xander."

"... Huh. No superhero name?"

Honestly, a brother with no superpowers is a serious dent in the Idealist story, and definitely a blow for the 'actually really plausible their universe is real' theory, given that it's so undramatic to have a superheroine and a mundane appear simultaneously, and Doc Dim was absolutely the kind of supervillain who ran on drama.

She pauses. "... Also, the police will be showing up soon, since this is, you know, where a lot of stolen property ended up. Do you have - vitally important questions to ask me about differences between the worlds or anything - before they come and take custody of the scene?"

"Uh. There's stuff in the category 'can we get a hotel comped' and stuff in the category 'do you need a minute to fix your hair or does that just work differently here'."

"They can almost certainly get you a hotel room for the night, I'm sure there's a Superhero Bullshit fund that applies to you. And, my... hair... is... fine?" She runs her fingers through her hair. (Which is slightly shorter than it appears in the picture, so as not to get in her eyes.) "Is hair important to your world's powers?"

"Among other things. So you are a 'superhero' and not a 'magical girl'? Was the mad scientist also a super- uh, villain, I guess?"

"... I'm sorry, MAGICAL GIRL?"

She coughs. "Yes. Yes, I am a superhero, not a magical girl. The mad scientist was a supervillain. Superheroes attempt to stop supervillains - and, uh, supervillain-type-things - from doing bad stuff."

The smile keeps creeping up to her face. "So, yes, please explain to me this 'magical girl' thing, and how it is totally a real thing in an alternate universe that is not mine, and how it works. Do you have magical transformation artifacts and mascots and called attacks and -"

"Do you have a secret identity and come back from the dead occasionally and represent the complicated attitude of society towards those who are different or exceptional?"