100/200 nl AA weird spot

[JMa]

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4 handed

utg (6k) folds, Hero (30k) raises 3x bb with A[img]/images/graemlins/diamond.gif[/img]A[img]/images/graemlins/spade.gif[/img], SB (40k) calls, BB (30k) calls.

J[img]/images/graemlins/diamond.gif[/img]9[img]/images/graemlins/diamond.gif[/img]4[img]/images/graemlins/spade.gif[/img] (pot: 1800)
chk chk, I decide to chk (not standard)

J[img]/images/graemlins/diamond.gif[/img]9[img]/images/graemlins/diamond.gif[/img]4[img]/images/graemlins/spade.gif[/img]3[img]/images/graemlins/heart.gif[/img] (pot: 1800)
sb chk, BB bets 1800 (probably any 2 here), I decide to call, SB calls too...

J[img]/images/graemlins/diamond.gif[/img]9[img]/images/graemlins/diamond.gif[/img]4[img]/images/graemlins/spade.gif[/img]3[img]/images/graemlins/heart.gif[/img]6[img]/images/graemlins/diamond.gif[/img] (pot: 7200)
SB leads 5200, BB insta folds, Hero folds....

Weird hand for me. Not many reads really. I'm curious if is it possible SB is blocking with like KJ? Is he buying the pot hoping BB doesn't have the flush? It doesn't make sense that he wouldn't lead turn with a flush draw right, unless he was going for a c/r on turn but got weird when I called the pot bet?

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Checking the flop and smoothcalling the turn is probably a very bad idea w/o reads.