it had nothing to do with the kid, the cat went for her throat initially. you're looking at a complicated reaction as a result of agitation, unfamiliarity, sitting posture (an easily accessible attack route to the jugular) and possibly getting glass in it's paws. but, what the cat was doing was trying to eat her, and the other one was hanging out hoping it'd get a bite.

i've been around a good number of cats, and an intent to eat me is something i've noticed in virtually all of them. it's never gotten to the point of being attacked like that, but i've met a few i wouldn't feel safe sleeping in the same house with without precautions. you can see it in the eyes.

what my conclusion with cats is is largely that they figure they're better off keeping you alive because you're feeding them daily. they may get a decent meal out of you for the start, but then what?

it's very common to hear about cats eating their owners if they die of old age. i gotta say it: if you decide not to feed one for a day or two, i'd make sure you have a good lock on your door...