[mikeca]

This is about as disconnected a flop as you can get, so he cannot have a strong draw. He should have AQ, KQ, AA, KK or 88 or something like that, but a really aggressive player might have something that completely missed this flop too. In spite of the disconnected flop, the backdoor flush draw still got there. If the Q[img]/images/graemlins/diamond.gif[/img] was not on the board I might be more worried about it.

If MP1 were a passive player, maybe a slow play in this case where it is HU with a preflop raiser on a disconnected board would be justified, but I see no reason to slow play an aggressive player here. Exploit his aggression. Raise the flop.