I was in imp city on my lowbie blue, I was farming mobs after capturing a flag, and then saw a red also farming mobs. We both kept to our business farming around, and then we moved apart. We ran into each other again in that hallway around the arena with the sequence of boss fights, and instead of fighting each other, we teamed up on the mobs and used only single target abilities, no dots were laid on the ground so we'd never kill each other, then we proceeded to complete the arena together! on two separate alliances! we both grabbed the chest and I headed back to the sewers after. The experience made me feel bad killing someone who was afk sneaking in a corner because I thought they were coming out of sneak to gank me...