Jumping in late, but I think I'm folding here. SB doesn't have the A-high, or he would have been protecting that to some degree on the flop, maybe 1/2 pot. I think 1/2 the time here, he's got K or Q - high flush, and the other 1/2 of the time he's holding something like 64xx suited. There's a weird outside chance that he's holding QQxx.
By calling, we're really just trying to gain information for the river ... if he leads pot again, we're folding ... if he checks, we're checking behind, and if he bets 1/2 pot we're probably calling just cause.
Overall, the SB should just be allowed the $5 pot ... he's betting into the field ... statistically we're probably not ahead of the field ... and there's no major reason to want to get involved for stacks over a J-High flush draw. The hand and the $1 we committed preflop was for the straight possibilities, not the flush.
We don't want to tangle heavily, the pot's not going to become monstrous unless we've lost it, and we're matching a $5 bet on what's essentially a coin-flip anyway (based on the KQ vs. 64 analysis) ... there's no great reason to continue in this hand.
