Lung whirls to face the newcomer the moment she takes her first step. 

The figure points a metallic tube at him; it hisses and produces a mist-like cone attack, which erupts into flames when it comes into contact with Lung.

Lung roars loudly enough to shatter windows in distant buildings. He leaps for the newcomer but misses - surprisingly badly.

The mysterious stranger rolls to the side and then tries to freeze in place. Lung seems to be blinded, swinging his head around wildly.

Oh right, Elan took that one teamwork power! The one where he shouldn't try to be the main hero hogging the spotlight.

"Thanks, dark mysterious stranger!"

The dragon guy seems to be having trouble seeing… Elan decides that as long as he's making noise he should keep his distance from her.

"Wanna team up? Uh, by which I mean I help you too, instead of you just helping me."

Lung leaps on the source of the sound.

A Giant monstrosity leaps on Lung.

Lung hits it. Despite the comical difference in sizes, this drives them a few feet apart.

Then the monstrosity shakes its head and charges Lung, carrying both of them off the roof.

"Uh. Alright?"

"...that wasn't me, I only do bugs."

"Hi puppy!"

Now that the altercation is off the roof, he decides that approaching Only Does Bugs won't needlessly endanger her.

"Huh, does everyone have animal powers around here?"

Oh god what did he just call her. Sheee is going to ignore that while running away from fighting for her life.

Really she's used to ignoring what people call her -- not the time, Taylor.

"N-no? I don't know who's controlling that thing. Um, why are you unmasked - sorry, not important right now - my bugs can't hurt Lung anymore. Can you fight him or should we run and call the PRT?"

"Oh, should I be masked? I just got here, uh… right before I started fighting Lung. I can avoid getting seriously hurt but to actually fight anyone I need a team. Is that what the PRT is?"

He didn't have his mask with him but he outed himself because Lung was going to kill some kids? Taylor really wants to be that heroic one day. (Preferably without outing herself.)

"The PRT fight villains, they work with the Protectorate who are the actual hero capes." She thought everyone knew that much, but then she took Parahuman Studies for a year and, yeah, some of the kids in her class are probably going to grow up into adults who won't know anything at all. But he's an actual hero so it's even more important that she gets him in contact with the PRT!

"There's an emergency number, do you have a phone or do we have to find a pay phone?"

Some of those concepts are unfamiliar, but he figures that "capes" is what people here call adventurers and the PRT is… well, if they're not "actual hero capes" maybe they're Neutral capes who team up with the Good ones to fight villains, or maybe they're more like law enforcement with NPC classes? Elan can wait to find out.

"Pay phone sounds good!" he says confidently, mostly because he's pretty sure he doesn't have a phone yet.

Before they can carry out their cunning plan of running away, two more monstrosities land on the roof. (They're jumping from another building.) These ones each have two humanoid riders, who get off.

"You really saved us a lot of trouble! When we heard Lung was going after us, we argued for half a day before deciding to fight him." Handshake?

Sure!

"You're welcome! He does seem pretty scary, with the getting really big and fast and lighting on fire and turning into a dragon thing. Now we're going to use a pay phone to call the PRT."

"Calling the PRT is a great idea! Much better than fighting Lung."

She whistles, and the two monstrosities jump down the join the fray. Lung is still fighting, but he seems to have stopped growing.

"Lung is getting creamed. What did you do to him?"

"Pepper spray, wasp and bee stings to the eyeballs, fire ants and spider bites to, ouch - it was all her, though." She points.

Um. "He helped? He drew Lung's attention - does one of you have a cellphone, we really should call the PRT." 

Bystanders have called PRT already. First responder, cape. Minutes out.

"Oh, they're coming. But we have a minute for introductions! We do owe you a favor. I'm Tattletale, these are Grue, Regent and Bitch - her chosen name, the PRT call her Hellhound -"

"And together, we are -"

"Shut up, Regent. We're the Undersiders. And we're leaving before the PRT gets here. Bitch, time to go."

She whistles, short-long-long, and the three huge creatures leave Lung lying in the street and climb swiftly to the rooftop.