This is a terrible call for this situation. If the BB has 72o, it's folded to the SB who limps, and he shoves I understand. In this spot he's seen someone has a hand to shove with. Any call in this spot is -EV because the hand is going to be behind almost every time. Only if I'm big blind with 20+bb stack and SB shoves to equal a min raise would I call with 72o. Outside of that scenario i never call.