With that board someone has to have a set. Again the min-raise rears its ugly head. With the flush draw you can still make your flush and if the board pairs you are screwed. Even if you make your flush on the turn they have Signifcant redraws. Why stick your whole stack in when you know you might make your hand and still have a very significant chance of being drawn out on. For example, if the turn was the 8 of clubs, JJ would still be 25% to make his full house. You are only about 25% to win here so you need closer to 4 to 1 to make the call...

I wouldn't have played A9s oop here either...