cold 3bet flushdraw on turn

[joop]

PP 3/6 6max, 6handed.

Hero dealt A [img]/images/graemlins/heart.gif[/img] 8 [img]/images/graemlins/heart.gif[/img] on button.

2 folds, LAG calls (80/30), hero raises, tight somewhat passive SB 3bets (15/10), unknown BB calls, LAG and hero call.

Flop comes 3 [img]/images/graemlins/heart.gif[/img] 9 [img]/images/graemlins/spade.gif[/img] 7 [img]/images/graemlins/heart.gif[/img], 4 players, 12 SB

SB bets out, 2 calls, hero raises, SB 3bets, 2 calls, hero calls. (Should have capped for value?)

Turn comes 3 [img]/images/graemlins/diamond.gif[/img], 4 players, 12 BB

SB bets out, 1 fold, LAG raises leaving himself with $3, Hero 3bets...

Anyone like this turn 3bet?