small flush deep vs tag

[praios]

Party Poker - No Limit Hold'em Cash Game - $3/$6 Blinds - 6 Players - (LegoPoker Hand History Converter)

SB: $1,248.00
BB: $656.00
UTG: $600.00
MP: $1,324.40
CO: $90.00
BTN: $338.00

Preflop: is dealt (6 Players)
UTG folds, <font color="red">MP raises to $22.00</font>, CO folds, BTN calls $22.00, SB calls $19.00, BB folds

Flop: ($72) 2[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/club.gif[/img] (3 Players)
SB checks, <font color="red">MP bets $52.00</font>, BTN folds, <font color="red">SB raises to $151.00</font>, MP calls $99.00

Turn: ($374) 3[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">SB bets $278.00</font>, MP calls $278.00

River: ($930) 8[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">SB bets $251.00</font>, <font color="red">MP raises all-in to $873.40</font>, SB calls all-in for $546.00
Uncalled bet of $76.40 returned to MP

Pot Size: $2,524.00 ($3 Rake)

i think with a flush he raises turn so i make a bluff block bet on the river that he can push his set. toughts?