He acts like it's nothing. Katniss turns to watch the now-blinded dinosaur stomp off in another direction. So she hadn't killed it, but it was a close run thing. Breathing hard, she whips around suddenly enough to have the element of surprise on her side before slamming one of her hands into his chest. It probably wouldn't even hurt him, given how skinny her arms were and how little upper-body strength Katniss posessed. But she had to find some way to get the anger out.

"You-- you're a fucking idiot, Gwaine," she shouts, visibly shaken from this latest brush with danger, especially from a body that was still getting used to not being on high alert all the time. "Do you have a death wish or something? I really want to know."