Hmmm... I don't understand this...
But lets say he raises the Button and we jamm our 12.5 bets AI from the small blind. He will call the shove with 50%... The call can never be profitable for him, even though he already invested 2.5 BBs with his preflop raise (pre ante..).
The way I would calculate it, the result would look like this... What am i doing wrong ?