I've seen a lot of players make this type of bet/call play when they are drawing to a flush or open-ended straight as a modified free card play. With two opponents on the flop (assuming he has a flush draw), his bet (1) puts him in the driver's seat, (2) builds a pot if he hits his hand, and (3) disguises the fact that he's playing a draw so that you are less likely to think he's got the flush if it hits. When one folds, the other raises, and his flush card doesn't hit the turn, he has to play slightly more defensively. However, he can't just check-call or he runs the risk of you making a