In the wake of what happened at the police station, guns are the last thing Stiles wants to deal with right now. Also, this isn't really staying out of trouble, something he'd promised Lydia he'd do.

So it's obvious Stiles doesn't really like having the gun pointed in his face, swallowing a little and raising his hands. But it doesn't shut him up, and he also doesn't leave.

"Guys, come on, seriously, there's got to be way better targets than her. Who's gonna come looking for some skinny kid?" He gestures to Rachel behind him, hoping this works and that he doesn't end up getting shot, or kicked becuase he's disparaging her. "Do we look like we're gonna get you noticed if you shoot us?"