I dunno. They're all superheroes, right? Maybe they're trying to keep it away from any supervillains that show up. If there even are any.

[He un-builds (look there isn't a much better word for it okay) the jet pack and lands on the ground.]

Well, let's see... [He mentally counts them off on his fingers one by one...] Far as I can remember right now, six. But I can change most of them to do even more stuff.