Straight faces river raise from unknown

[MikeyPatriot]

READS: Villain is unknown, but judging by his stack size and some initial observation he is probably a bad player.

PokerStars No-Limit Hold'em, $1.00 BB (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Hero ($108.10)
UTG ($101)
MP ($75.35)
Button ($70.10)
SB ($161)

Preflop: Hero is BB with T[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">2 folds</font>, Button calls $1, <font color="#666666">1 fold</font>, Hero checks.

Flop: ($2.50) 8[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $2</font>, Button calls $2.

Turn: ($6.50) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $4</font>, Button calls $4.

River: ($14.50) J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $14</font>, <font color="#CC3333">Button raises to $33</font>, <font color="#CC3333">Hero ???