Confused after flopdonk in capped pot

[villains_hero]

15/30 6-handed, Pacific Poker

Villain 35/24/2,4, I respect him as a strong regular, probably reading this and probably playing better LHE than I do. No notes about him donking.

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Hero opens from the hijack with A[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/heart.gif[/img], SB 3-bets, 1 fold, Hero caps, SB calls

Flop 2[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/diamond.gif[/img]

bet, [img]/images/graemlins/confused.gif[/img], raise, raise, call

Turn Q[img]/images/graemlins/spade.gif[/img]

bet, fold