*** grunch ***

I probably re-raise the river here. It looks like he might be bluffing. The only 2 hands you have to worry about are a higher pocket pair or if he has is a 6. Few people at this level can resist the urge to raise a full house on the flop. I think you are ahead here more often or not.

I think it would take a ton of restraint for him to wait until the river to raise you. To me, it looks like a random bluff attempt and I squeeze him for it.