We are just calling that river bet. He could be playing the flop aggressively with top pair and the flush draw, based on the stop & go turn action. If he's bluffing the scare card on the river, he loses 1 bet when we call him down. If he has a legitimate hand we cannot beat, then we are getting 3-bet here often. I am calling this against most villains, except the most lagtard. The other streets are standard.