Her logic made some sense to him. Well sure, of course his adventure had just started! After all he was finally off the blasted island he'd been stuck on his entire life! ... Now he was stuck on a new one, but this one at least had people as well as monsters. It was an improvement of sorts as far as he was concerned. Of course that wasn't going to be something he'd be able to enjoy for long if she didn't stop trying to impale him on that sword of hers.

Before Jake had a chance to even react though she was being tackled do the ground. Who would have though he'd be saved by a monster? There was a moment of hesitation on his part before he pulled his handguns out of his strife deck. While Maria does seem to be handling the monster well enough on her own, Jake wouldn't be much of a gentleman (or any kind of man at all!) if he just let the girl get assaulted by the beast.

So taking aim (easy to do this close up) and waiting for the monster to lift it's head up enough that Jake could be sure he wouldn't hit Maria by accident, Jake fired a shot at its head.