I found out from someone that you can fight Dark Tooth in deathmatch. This makes deathmatch more fun and this fight is one you fight in deathmatch and is actually harder than Tower Tooth. You will fight the smaller Dark Tooth with less health. They give you the small one to fight, so he can fit everywhere. The best thing to do is to kill Dark Tooth first and fast, before he kills you with his strong machine gun. I will check and see if ATV can survive this.