Having 'caught' her prey, she's more or less oblivious to his movement-- lucky for Chase he's not particularly easy to take a chunk out of, though chances are he's bleeding beneath her ministrations. As clever and rational as Cameron has been thus far, her patience and apparently her sentience has diminished with distance.

She stiffens and straightens at the needleprick, shooting him a wild, accusatory look that almost recalls sanity. Pulling away, she takes a wavery step backward, as though she's not quite sure what bit her. Or maybe she's just shocked to have been outsmarted.

Before she can gather her wits and poise to strike again, she sways, and begins to tumble.