A dubious flop reraise

[Robb]

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Commerce 20/40 full table. The game is terrible and I'm second on the list for a table change. I raise 9 [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/club.gif[/img] UTG. A Rock at the table is two players to my left and cold-calls. Folded to button who folds faceup A [img]/images/graemlins/heart.gif[/img]10 [img]/images/graemlins/heart.gif[/img] and says, "I'm folding this only because you're raising, so you better show something good." BB calls. Three to the flop.

FLOP: A [img]/images/graemlins/diamond.gif[/img]J [img]/images/graemlins/heart.gif[/img]7 [img]/images/graemlins/club.gif[/img]

BB checks, I bet, the Rock raises. BB folds, I 3-bet...

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If he's a rock and he called an utg raise, then it should be a big hand he played passively preflop. If he's like most rocks then postflop he has precisely AK/AQ. Maybe AJ and maybe JJ.
So I'm not sure what a flop re-raise does for you - I guess you put him on something else so I'm curious what you think he had.