?! [Might have only been listening/paying attention with half an ear, but it's hard not to notice something like that. Jumps in surprise, at least as well as he can on all fours in a cramped ventilation shaft (which isn't very well, he manages to hit his head on the ceiling, ow) and tries to twist his neck to glare at her as much as possible.]

What do you think you're you playing at?!