[BTirish]

I don't like calling third here. Since you did, though, I think you played the hand well, except that I would have capped it on 4th. I don't think you mind chasing out, if possible, the 4-flush (as it turns out, he wouldn't have gone anywhere). A lot of times on 5th I think Seat 3 is going to be jamming it with a straight draw + flush draw or a flush draw and pair rather than a made straight, but if he does have a straight draw or a made straight then he might have one of your 8's. What sucks here is that the 8's are in fact totally dead--I'm not sure if there would have been any way to guess this given the action. As it stands, you have less than 20% equity on 5th instead of more than 30% (or more than 44% if he doesn't have the straight).

In the moment, I probably play it almost the same as you did--I don't think I could give credit for the straight on 5th. Slowing down after that is smart. The pot is gigantic, so folding for one more bet on the end would be crazy.