Avalanch! Both combatants are placed on a mountain thats seconds away from giving way. They have to fight each other, dodge huge chuncks of ice, and last but not least outrun/dodge the monstrous Avalanch before it claims them both!
YAY! MY IDEA IS TAKEN INTO ACCOUNT! And what about a giant yeti monster? Who's only there 'cause it's a part-time job to pay for college?