HU play against semi-fishy player

Don't bluff a semi-fishy player?

PokerStars 3/6 Hold'em (5 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with 8[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">SB raises</font>, <font color="#CC3333">Hero 3-bets</font>, SB calls.

Flop: (6 SB) 4[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">SB 3-bets</font>, Hero calls.

Turn: (6 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero folds.

Final Pot: 7 BB
<font color="#009B00">Main Pot: 6 BB, won by SB.</font>
<font color="#009B00">Pot 2: 1 BB, returned to SB.</font>

[jt1]

Hu man. I'd fold to the 3 bet. SB raised preflop, led the flop and re-raised. Most likely he has the king