Top Pair, Good Kicker, Fold Flop?

[spydog]

MP2 is unknown.
BB is a TAG.

I felt like a deer in headlights on this flop. Thought for about 10 seconds and dumped it. What do you think?

Party Poker 3/6 Hold'em (10 handed) converter

Preflop: Hero is UTG with Q[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/spade.gif[/img]. CO posts a blind of $4.
<font color="#CC3333">Hero raises</font>, <font color="#666666">3 folds</font>, MP2 calls, <font color="#666666">4 folds</font>, BB calls.

Flop: (7.66 SB) A[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP2 raises</font>, <font color="#CC3333">BB 3-bets</font>, Hero folds.....

[Nick C]

Tough spot. If BB just has, say, the naked K [img]/images/graemlins/diamond.gif[/img], you wouldn't think he'd want to drive you out. Something like a medium flush or maybe even a set seems more likely to me, though I guess he could also have top pair, maybe with a diamond kicker.

In the heat of the hand, I'd probably call and see what the turn brought, partly because I'm not at all convinced I'm behind MP2. But I think the fold is okay.