Btw
storm1051787 , it's nice you have come here. I've managed to have a little time to check Diana fight. MC got fatally wounded once, not twice. Also, he ends the fight twice. At first, he quickly moves and hits Diana and make her flying, then she hit the hull of the ship. MC stops the fight to talk to her instead of ending her. Secondly, MC grabs her by the neck and basically ends the fight. He did not break her neck because he does not want to kill her. There is even a dialogue option there, the interrupt there is that long. Then, at the end they knock each other down but while he recovers, she almost died. So MC, heals her. If you count ice cube thing as second knock out, it's not because while Diana preparing final blow there he melts the ice. All in all, even according to your round counting way MC is the winner of that fight.
Round 1 : Diana stabs MC's neck. Diana's win.
Round 2 : MC yeets Diana to ship's hull. MC's win.
Round 3 : MC grabs the Diana by her neck. MC's win.
Round 4 : Diana and MC knock each other out but Diana gets more damage. MC's win.
Final score : MC 3 - Diana 1
Or we can look at my way and say, MC reached his goal by saving twins. MC won the fight.
Or we can look at as one continues fight. They knock each other out at the end. Diana got hurt more and almost died. MC won the fight.
In all cases MC won. Toodaloo.