It's weird that he bets the turn so much after calling the flop. The 4 obviously doesn't help him beat us. 56s is so in his range here, certainly at the turn, so not folding here. River jam screams value though. This doesn't look like a straight now, not for someone who you say is nitty post flop. Feels like a fold but it's hard to understand why he decided to bet turn so much if he already had us beat. Tens kinda makes sense. Or some godfuckingawful 74s. T7s. idk, I think I pukefold river.