[PLO 50] 2nd Set faces big river bet

[Ed_Warren]

Villain (75/3,90/2.19/River AF 9)

PokerStars Pot-Limit Omaha High, $0.50 BB (4 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

BB ($69.20)
UTG ($52)
Hero ($52.30)
SB ($50.10)

Preflop: Hero is Button with J[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls $0.50, Hero calls $0.50, <font color="#666666">1 fold</font>, <font color="#CC3333">BB raises to $1</font>, UTG calls $0.50, Hero calls $0.50.

Flop: ($3.25) 4[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">BB bets $2</font>, UTG folds, Hero calls $2.

Turn: ($7.25) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $2</font>, <font color="#CC3333">Hero raises to $11</font>, BB calls $9.

River: ($29.25) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $27.85</font>, Hero ?

Is my slowplay on the flop bad ?
With his stats this is an easy call right?