[shpanko]

This is tough because you think he'd have to bet and good made hand on the flop because the pot is 3-way. I mean if he's a semi-regular he needss to be betting 44 there aw well as good aces. Have you known him to slow-play on boards he shouldn't?

The only hands that make some sense are T9 (w/ or w/o flush draw) and A9 (AdXd could play this way as well).

To be honest though this looks a lot like a draw that is trying to push you off a hand, I mean if he's a decent semi-regular that doesn't slow play on wet boards then you should have him beat here like always unless he has T9/A9.