When there is one raiser, and you're in the BB you're looking at 3-1 to see the flop (count SB cancelling out with the rake). In theory you need 25% pot equity to justify calling the raise. You have over 25% pot equity with any situation except if villain has a pair and you have 2 unders - then around 20%. Yes, you are out of position for the rest of the hand, but this is something to think about.