Headbutt duel: Superman vs. Captain Marvel
Rules:
1. The combatants hold onto each other's forearms and keep each other at arms' length.
2. Each combatant is given a turn to headbutt the other as hard as they can.
3. The person receiving the headbutt is allowed to brace themselves but are otherwise not allowed to move.
4. Person delivering the headbutt is allowed to levitate a max of 2 feet in the air to gain leverage as long as they maintain their grip on their opponent's forearms.
5. Person who lets go of the other's arms first loses.
Who wins?