God, it's a shame he's not himself. That butt wiggle would've been the funniest thing in the world, but that's not what he sees now. What he sees now is an attack, and it only makes him mad.

He makes all the snarling noise of a provoked canine and lunges forward, snapping jaws and all. It's clearly not a threat this time- he has every intention of sinking his teeth in and flinging him around a bit, since that's what usually works on things smaller than him. And the quicker he gets kitty out of the way, the quicker he can get back on track.