.25/.5 valuebet nut straight when the backdoor flush hits?

[Grandezza]

villain is 66/0/0.21 over 33 hands

Full Tilt Poker
Pot Limit Omaha Ring game
Blinds: $0.25/$0.50
5 players
Converter

Stack sizes:
UTG: $94.85
CO: $36
Button: $53.50
SB: $37.90
Hero: $104

Pre-flop: (5 players) Hero is BB with 5[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/spade.gif[/img] 4[img]/images/graemlins/spade.gif[/img]
UTG folds, CO calls, Button folds, SB calls, Hero checks.

Flop: 4[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] ($1.5, 3 players)
SB checks, <font color="#cc0000">Hero bets $1.5</font>, CO calls, SB folds.

Turn: 8[img]/images/graemlins/club.gif[/img] ($4.5, 2 players)
<font color="#cc0000">Hero bets $4</font>, CO calls.

River: A[img]/images/graemlins/club.gif[/img] ($12.5, 2 players)

[CrushinFelt]

c/c

[BarryLyndon]

[ QUOTE ]
c/c

[/ QUOTE ]

Yeah.

[Grandezza]

what are you hoping to get a bet from? bluff? doesn't this just allow him to bet his flush hands and check behind with the hands we beat? sorry if it's obvious that he bets worse hands but I'm a PLO newbie.