Beautiful slowplay had me completely fooled

[keikiwai]

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $1/$2
6 players
Converter

Stack sizes:
UTG: $198.95
UTG+1: $203
CO: $287.30
keikiwai: $274.80
SB: $192
BB: $302.35

Pre-flop: (6 players) keikiwai is Button with 4[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/spade.gif[/img]
<font color="#cc0000">UTG raises to $7</font>, UTG+1 calls, CO folds, keikiwai calls, 2 folds.

Flop: 2[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] 5[img]/images/graemlins/spade.gif[/img] ($24, 3 players)
<font color="#cc0000">UTG bets $17</font>, UTG+1 folds, keikiwai calls.

Turn: 4[img]/images/graemlins/heart.gif[/img] ($58, 2 players)
UTG checks, keikiwai checks.

River: A[img]/images/graemlins/club.gif[/img] ($58, 2 players)
<font color="#cc0000">UTG bets $35</font>, <font color="#cc0000">keikiwai raises all-in $250.8</font>, <font color="#cc0000">UTG calls all-in $139.95</font>.
Uncalled bets: $75.85 returned to keikiwai.

Results:
Final pot: $407.9
<font color="#black">keikiwai showed 4[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/spade.gif[/img]</font>
<font color="#black">UTG mucks 5[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/heart.gif[/img]</font>