[gergery]

It depends what x is on the flop. If its AQ9 then he is much more likely to have 2-pair or straightwrap. If its AQ5, then its quite possible he has 23xx.

This matters because if you check the river, medium strength hands like two pair are more likely to just check behind because they can win in a showdown. While wrap or lowdraw hands are more likely to bluff because that’s the only way they can win.

So the more likely it is that he was drawing and the more aggro he is, the more likely I am to check-call. The worse he is or the more calling station, the more likely I am to bet and fold to a raise.

-g

I just read cookers answer and its pretty cool that I can say what he did but use more words.