Battle to the bitter end with a rival. Make it as epic as possible!!!! If it's not epic enough then it will be moved to the sparring range. (Killing isn't allowed, but injury and loss of limbs and eyes is very likely.)
Battles between people that just can't stand one another and want the other dead. Battle to the very end here. (Death isn't a possibility, it is an actuality. Someone will die at the end of every match.)