confusion +semibluff

bad call preflop?
on the flop i didn't think he had a set... i don't normally see people raise 3x with a set on the flop.. they usually wait till the turn... still a bad call tho... correct?
turn confused me... initial thoughts were he was trying to trap on the river... then when the flush card came i figured the odds were good it would scare him... + the fact that he checked the turn could possibly have been weakness.. i figured a semibluff on the river would be good... thoughts?


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

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

Hero ($125.40)
UTG ($76.03)
MP ($240.04)
CO ($98.50)
Button ($219.55)
SB ($105.80)

Preflop: Hero is BB with Q[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/club.gif[/img]. SB posts a blind of $0.50.
<font color="#666666">1 fold</font>, MP calls $1, <font color="#CC3333">CO raises to $4</font>, <font color="#666666">2 folds</font>, Hero calls $3, MP calls $3.

Flop: ($12.50) 6[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $8</font>, MP folds, <font color="#CC3333">CO raises to $24</font>, Hero calls $16.

Turn: ($60.50) 9[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, CO checks.

River: ($60.50) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $45........