I think I'm check folding this turn. I've been trying to figure out what our villain could have played like this that he limped UTG+1. 55-88 or maybe 99, two big diamonds or Ax of diamonds.... If he had flopped a set with 55 or 66 that's an awfully bullish line heads up, so those seem a bit less likely. So on that turn 77 just made a set, 88 or 99 is still ahead and might have a better flush draw and two diamonds have you drawing dead. Given we only have 50 hands on the villain here, but if he is a solid tag as they would hint toward, I'm not sure what other hands we can throw in here. I think you have to be behind, and your flush draw is rarely live.