[samoleus]

I usually fold because of BB's call. I think you are ahead of SB more often than not, but BB checked the flop and then called 2171 after considerable action before him. Sounds like a monster there. Unless he is a donk that will call off so much on just a flush or straight draw, I think you are behind way more often than not. And even if you are not behind, he probably has between 9-15 outs to beat you (I doubt you are against 99; if you are ahead you are probably against something like As2s I'd think. And if you are behind, you are likely drawing to two outs. And of course, though probably unlikely based on what you are saying, there is the not insignificant chance that SB is ahead of you. I think this is a fold.