[sharpie]

We don't really want him folding AA assuming we always get 2BB in on the river if we just call. He has 4 outs and the pot is ~13BB, so by making him fold we gain ~1.3BB, and by waiting we make 2BB. I am still tempted to cap the turn though as I'm guessing more often than not he won't fold, and if he does we might be able to take advantage of that later on, although if he's good he'll probably make a note that he made a big laydown against you so maybe this doesn't apply.