Equal Ground.

The giant lizard camouflaged itself to look like a log of wood on the forest floor. It even has a covering of algae, ferns, and small plants growing on its back to help it maintain the image. It didn't move until they got very close to it. Then it took a large bite out of both the python and its target. The three-way struggle ended pretty quickly in favor of the giant lizard. It is very difficult to keep on fighting when you're missing a large portion of your body.

The person, though skilled, died in a double ambush and was respawned in another location with a permanent 10% debuff on their current score and future scores. You can be killed in this challenge. Your brand will save you before you actually die. It will pull you from the world and you will be kept in Stasis. Then your injuries will be healed and you will be respawned in another location in the arena. You can die as many times as you want but you will receive a debuff to your scores every time.