[Jeffage]

One day you will actually complete with your big pair on 3rd rather than limpraising with it. I know you will.

On 4th, I'd wait to see if he rags off on 5th instead of reraising. A 4-flush is in pretty good shape on his end and I doubt he raises you on 4th with just 9's. I think he has a 4-flush, pocket pair or trips in that order of probability, with 4-flush being most likely. If he bricks on 5th, you bet.

As played, I see no reason to bet 5th. He will bet for you whether he has the flush or not. The question is whether to check call or check fold. If you bet and get raised, it's not that reliable to telling you if he has 4 flush (could have one pair and 4 diamonds).

Go with your gut on this one, but I lean towards check folding 5th as played unless this guy's style of play dictates otherwise.

Jeff