Who’s stronger. Kevin wins

Eric and Kevin are both shirtless. They only exchange gut punches in the fight. They trade punches a few times in a time, and the punches are so deep that they nearly spit out. Finally one cannot stand the punch and spits. Then he gradually regains his consciousness and is able to punch his opponent until another one spits out.
There are two endings with one Eric winning and one Kevin winning the contest. The loser is gut punched very deeply and spits out dramatically and gradually loses his consciousness. The winner then places his leg on the opponent’s body, flexes and poses.