And a pair of alarmed teenage girls fall through a sudden, brief hole in reality.

The girl in a greenish-silver costume with a mirrored mask in front of them is also alarmed, if you go by the way she dropped the heavy metal box she was carrying and shrieked when they arrived. Or that could be just the way a lot of people who look like they are in a fight have suddenly stopped said fight momentarily to stare at the three girls.

"Who the fuck are you?" asks a man in blue armor with a long halberd half a second before he has to use it to parry an attack by something that can best be described as a wolf made of sharp whirring metal bits. Taking that as their cue to resume the fight, the other participants take various actions too numerous for this margin to contain in their entirety. A few examples include, however, a large lizard-y man trying to set someone on fire, a person in a blank mask shooting at another man in armor, said man in armor making a metal cage appear around the three girls, and a girl sending a crate skidding against that cage not a second after it emerges from the ground.

The metal cage liquefies and becomes a shield around the newcomers.

"I'm Emily and this is my sister, Edie. Where are we?"

Spooked girl has decided to be spooked by whoever just managed to melt Kaiser's blades.

"Uh, um, Brockton Bay, Earth Bet? Uh, your Earth might not have a Brockton Bay if it's not Aleph, I don't know about other ones and what they have..." She glances at the box at her feet then back up. Not the time to worry about the incredibly valuable tech there.

(Also a buncha blades start sprouting from the ground just beyond the shield to separate the fight from the part where all the tech is.)

Those blades are left alone.

"Earth Bet? Earth Aleph?"

"Multiple Earths? ...I assume you're from an Earth, since, American English and all. This place, a tinker—uh, they might not have those names—someone with tech powers, his specialty was interdimensional stuff—uh..." She looks down at the box again.

"Tech powers?"

"Does your world not have those? I guess Bet has the most powers—they—us—we can build ridiculously advanced technology. Like my, uh..." She looks at her armbands, tries to touch its screen a few times, and frowns at it. "Well, it's on the fritz, great," she sighs.

"--We have people with powers. Just not--tech powers? I mean, there's Beast, but he's just really smart, the inventing stuff isn't a specific power."

"Yeah, no, here it's a specific power, people get specialties, mine's weird but today I got something akin to invisibility except this stupid box fucked with it—" She moves as if to kick it but then thinks better of it and decides to take a step back instead.

"Huh. So what's with all of the, uh, violence?"

"This particular tinker was arrested a while ago and no one knew about this warehouse and now people are fighting over his tech. Uh, there's at least two gangs plus the good guys."

The other one purses her lips. "Which ones are the good guys?"

"The one who swore at you is one of them, the lady with the weapon that's lots of weapons is another—there's a magnet guy, I don't know him, he must be new—uh, I didn't look at all of them, I was focusing on not being caught."

Everyone except Helpful Explainer, swearing guy, weapon lady, and magnet dude suddenly falls unconscious.

Helpful Explainer does not immediately notice this, but the others do.

"...what just happened?" asks weapon lady after a few seconds.

Edie raises a hand. "Hi, we're incredibly lost."

...the three remaining awake people walk up to them carefully. "Who are you?" asks weapons lady.

"My name's Edie and this is my sister Emily."

"—are those your actual names?" asks Magnet Guy who sounds like a teenager himself.

"How did you manage to be lost in the middle of a cape fight?" weapons lady asks, bemusedly. They still haven't introduced.

She points at the machinery. "Something went off by mistake? Or something? Five minutes ago we were at home."

"Yeah, they're our actual names, why wouldn't they be?"

"It's not customary for people with powers on this Earth to use their real names. I go by Miss Militia, this is Armsmaster, and this is Magnet Master."

"I'm not very creative, okay? And I wasn't originally from Brockton Bay," the boy defends his name.

"Did you two do that?" the one called Armsmaster asks, gesturing at the passed-out people with his halberd.

"That was me."

"I mean, the grownups have codenames and stuff, but they're mostly for fun. Our dad's called 'Magneto,'" she offers to her presumed conpotent.