0 is when a cat has yet to consider the premise that it may eat you. note the empty, blank stare.
1 is when a cat is thinking through the idea that it could potentially eat you. notice the more ponderous posture.
2 is when a cat has decided that it will, in fact, eat you, as soon as it gets the chance. notice the hunting eyes and ready jaw.
and, while a cat in stage 2 may spend years biding it's time, and developing schemes, it won't ever change it's mind. and, quite a few get the chance, eventually, too.
and, that's the thing about cats - they really do fully intend to eat you, eventually.