[Grease]

What if he has high hearts. I think checking the river is not FPS, but a textbook example of inducing a river bet against an aggressive opponent. He his tight and aggressive; he isn't calling down very often here with losing hands as the pot is small. Leading out will most likely make him fold (or worse yet raise), but if the hero checks, he has a high possibility of calling the induced bluff. Just my two cents.