[acewithaface]

Reraising the flop is much better, than waiting for the turn to raise him. if he flopped a set, he will raise u back on the flop, and if he is on any kind of draw or top pair, he will not raise u back. My guess is he flopped a set of 9's(becoz he would have 3bet preflop with Jacks).Again, it depends on how good a player he is.