In this situation, with a guy with last than 2xBB, I"m insta folding TJo in this spot. In fact I fold it so vehemently, I"m in danger of putting my forefinger right through the top of my mouse!
Even shoving in this spot is really bad - if we assume the big stack folds, the shortstack has to call his last 100 chips, and we are going to win the hand 55% of the time (TJo vs random hand). For the 45% of the time that we lose, we double him up and close the gap between us as shortstacks, and are in the BB next hand. If the BB wakes up with a hand, and calls anything in the top 15% of his range, the shorty rubs his hands in glee and folds, and we are a 30% dog to bust out.
With such a shortstack in play, there is very little point us entering the hand with anything worse than top 5% - we risk our entire tournament equity, when it"s highly likely that folding here will get us into the money. If the shorty happens to double up, or the BB gives him a walk, we still have distance between our stack and the short stack.
If our seat positions were different, and we had the big stack on our right, we can shove over the shorty SB v BB every time..... but it just isn"t worth taking the risk of shoving through the big stack here. If our stack and the short stack are closer, or if we have fold equity over the shortstack (ie he has enough chips to fold), then shoving here is ok - but definitely not in the specific example.
