[Leptyne]

Looks to me like a cagey move designed for you to take him off a flush draw. If he c/c and hits the flush on the river you might not call or could check behind. I don't want to play a big pot with TPTK either. Passive players are tough to read.

But you're tough to read too. And you have position. UTG doesn't want to lose his stack either. I think a smooth call will show weakness and lead to a larger river bet even if the flush doesn't show, except that you don't say anywhere in your analysis of him that you've seen him make a move. If you've been calling his raises liberally in the past I think I'd do the same here and see what the river brings. Since you've got position you'll have better opportunities to get a piece of this guy.

Until I see him make a move I'm going to assume he's got the goods when he brings it on the river.