Later, much later, when they are back home and perhaps a few nights have passed, Alida will turn to Marc and say I could be so much worse.
That is the extent of what she thinks about Grave's reaction. She is a bit annoyed that it tore off his arm, however, and then it gets two bullets to the third eye. "That wasn't polite." No, it wasn't, Alida, but that's not really the important part is it?
The inherent problem with fighting zombies in a graveyard? More of them than you. Alida briefly wonders if they are going to run out of bullets. She would consider biting them and then vomiting their blood back in their faces but that seems to work best on would-be rapists, not zombies. "I wonder what all this is about, anyway." Back to the treebranch, then, to save ammunition.