No fear! (Joker gets aggressive)

[Ryno]

It really looks like he has a 5, like he was *planning* to raise the turn except the hand he put you on just got there, but he doesn't have the stopping power to adjust his line. If you've been beating him, there is a decent chance he checks behind the river with a 5. If he has a lesser flush and raised the flop with a flush draw, it seems like he'd be too gambooler-happy to put you on a hand until you 3bet the turn.