Capping the flop with the nut flush draw? (boring)

[setzf]

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Reads would be helpful from OP. (ie. is BB a total donk or could he be sitting on a set here?)

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Read on UTG

UTG joined the table after I sat down. He bought in short at 132.50 (telling me it's his whole account balance). He posted BB as the CO on his first hand. He did show down a limp re-raise once and showed J[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/diamond.gif[/img]. Though he check-called when he missed the flop. His VPIP was 64%.

Read on BB

BB a donk. He had a stat of 54% VPIP. He started the hand shortstacked with $61.19 that seemed to be all he had. Here is a good example of his donkish-ness. He is the <font color="red">small blind</font> in this hand:

Party Poker 3/6 Hold'em (6 max, 4 handed) converter

Preflop: Hero is BB with 3[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img]. UTG posts a blind of $4.
UTG (poster) checks, Button calls, SB completes, Hero checks.

Flop: (4.33 SB) 7[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, UTG checks, Button checks.

Turn: (2.16 BB) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, UTG checks, Button checks.

River: (2.16 BB) T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, Hero checks, UTG checks, <font color="#CC3333">Button bets</font>, SB calls, Hero folds, UTG folds.

Final Pot: 4.16 BB

Results below:
SB has 6c 9h (one pair, jacks). <font color="red"> Why did he call the river with nine high?</font>
Button has Ah 6s (one pair, jacks).
Outcome: Button wins 4.16 BB.

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Im curious why you didn't bet the turn here.