Bluff gone bad but turned good

This post has no point.

Party Poker $50 No-Limit Hold'em, $0.50 BB (6 max, 6 handed) FTR converter on zerodivide.cx

saw flop|<font color="#C00000">saw showdown</font>

UTG ($39.22)
<font color="#C00000">MP ($64.35)</font>
CO ($91.90)
<font color="#C00000">Hero ($85.41)</font>
SB ($55.15)
BB ($37.35)

Preflop: Hero is Button with A[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/spade.gif[/img]. SB posts a blind of $0.25.
<font color="#666666">1 fold</font>, MP calls $0.50, CO calls $0.50, <font color="#CC3333">Hero raises to $3</font>, <font color="#666666">2 folds</font>, MP calls $2.50, CO folds.

Flop: ($7.25) 9[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets $5</font>, MP calls $5.

Turn: ($17.25) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets $13</font>, MP calls $13.

River: ($43.25) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP bets $5</font>, Hero calls $5.

Final Pot: $53.25

Results in white below: <font color="#FFFFFF">
MP has Jh Td (one pair, nines).
Hero has Ac Ks (one pair, nines).
Outcome: Hero wins $53.25. </font>

The river bet was so small I had to call to see what he had. Glad I did.