[Oblivious]

You have to raise the flop. Often times you will be isolating BB when he has a worse jack. If SB caps you have to improve on the turn to continue with the hand.

Assuming you only call the flop, i think you have to raise the turn after SB slows down. Again, BB could be betting a worse jack.

Assuming you only call the turn, I think you have to fold the river. SB could 3bet behind with KQ and you would be committed at that point. Im guessing BB had JT.