TPBK, easy fold?

[Rakkad]

UTG is at about 55/18 in vpip and pfr. Though he hasn't done anything out of line post flop. I thought the BB coldcalling screamed draw and was surprised to see him fold when it hit. Thoughts?

Party Poker 10/20 Hold'em (6 max, 6 handed)

Preflop: Hero is SB with A[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img].
UTG calls, MP calls, CO calls, Button folds, Hero completes, BB checks.

Flop: (5 SB) A[img]/images/graemlins/spade.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/heart.gif[/img] <font color="blue">(5 players)</font>
<font color="CC3333">Hero bets</font>, BB calls, UTG calls, MP folds, CO folds.

Turn: (4 BB) 3[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
<font color="CC3333">Hero bets</font>, BB calls, <font color="CC3333">UTG raises</font>, Hero folds, BB calls.

River: (9 BB) K[img]/images/graemlins/spade.gif[/img] <font color="blue">(2 players)</font>
BB checks, <font color="CC3333">UTG bets</font>, BB folds.

Final Pot: 10 BB

[Dov]

Maybe BB was on an A with a wheel draw...