middle pair on monotone board

[b33nz]

this is some 215 tourney (i think 2nd chance, given stacks). no reads. villains line is very odd. i dont think he ever has any two pair, any set (except 5s), or a straight. villain could have flopped a flush or have a A[img]/images/graemlins/spade.gif[/img]Q type hand. he also could just be making a straight bluff or a semi bluff with just a lone A[img]/images/graemlins/spade.gif[/img]. any suggestions?

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (9 handed) internettexasholdem.com

MP2 (t2110)
MP3 (t5625)
CO (t2730)
Button (t3501)
SB (t5160)
BB (t6115)
Hero (t7220)
UTG+1 (t2305)
MP1 (t4035)

Preflop: Hero is UTG with A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/diamond.gif[/img].
<font color="#CC3333">Hero raises to t300</font>, <font color="#666666">3 folds</font>, MP3 calls t300, <font color="#666666">4 folds</font>.

Flop: (t750) J[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, MP3 checks.

Turn: (t750) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t450</font>, <font color="#CC3333">MP3 raises to t1400</font>, Hero