Here's how this works.
You can choose whoever you like to battle against. If somebody is currently engaged in battle with another person then you may not also start a battle with them. You may, however, get in line or start a combination battle if the current battlers are ok with that.
You may not kill your opponent in the first move with a bullet to the head or other such dull maneuvers. Keep it creative people. Also, this is not a tournament but more of a fun thing to do. Pick somebody and go for it. Having a sqabble with somebody in the chat thread? Take it to the battle thread. Think somebody smells like rat infested rabbit? Let them know in the battle thread.
This is meant to be a fun scenario. We're taking it back to the way that it used to be. Hope that you guys enjoy this.