AQ from SB - WTF? Wasn't I the aggressor?

[Rocco]

Hand from $3R+A. BB seems better than average for this level, haven't really pegged EP limper since I've got three more tournaments in focus.

Stacks:
Hero (SB): ~T37000
BB: ~T42000
UTG+2: ~T22000
AVG: ~T20000
Blinds: 300/600

Hero is dealt A [img]/images/graemlins/spade.gif[/img] Q [img]/images/graemlins/heart.gif[/img] in SB
UTG+2 open-limps. Folded to Hero who raises to 3000. BB calls and so does UTG+2.

Flop: A [img]/images/graemlins/club.gif[/img] 8 [img]/images/graemlins/diamond.gif[/img] 2 [img]/images/graemlins/spade.gif[/img]

Hero decides to check and represent fear of the ace. BB bets out 3600 into a pot of 9000. UTG+2 shoves his stack. Hero???

I know it might be a bit of a FPS trying to represent specific hands in a low buy-in tournament while it's still quite early. But the questions are... What does UTG+2 limp-call and then shove on a rather dry flop? What does BB bet small on this flop? If there was two of a suit I would suspect the usual flush draw.