200BB Set vs ? hand

[TheRempel]

Late in a session this hand came up. Villian is 27/15/3. No major reads except that I have seen him fire three barrels before when he raised preflop. He also likes to enter most of my pots. I was playing 45/25/4.

Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $1/$2
5 players
Converter

Stack sizes:
UTG: $200
TheRempel: $1458
Button: $391.65
SB: $201.80
BB: $421

Pre-flop: (5 players) TheRempel is CO with 7[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img]
UTG folds, <font color="#cc0000">TheRempel raises to $7</font>, Button folds, SB calls, BB calls.


Flop: ($21) 7[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] (3 players)
SB checks, BB checks, <font color="#cc0000">TheRempel bets $21</font>, SB folds, <font color="#cc0000">BB raises to $84</font>, TheRempel calls.

Pretty standard. He's tight enough that I doubt very much he'll play a big pot with me if I raise without 44/33/56 but i think he'd raise this spot fairly wide, including some overpairs that he may figure to be best or have fold equity.

Turn: ($189) 2[img]/images/graemlins/spade.gif[/img] (2 players)
<font color="#cc0000">BB bets $140</font>, TheRempel ?

This is the first time I'd seen him take this kind of line against the preflop raiser on what is a fairly dry board. I'd been running over the table for about three hours at this point and it felt to me like he was likely bluffing. The bet size on the turn is really weird. I would expect him to bet either more or less with the nuts since my range is wayyy behind 56xx. I'd often just call with 56 on this flop but I doubt he knows that since I've been very aggro.

Thoughts?