Anyone ever got involved in a 1v1, sure you have. And why? because you had a grudge against someone, or, you just wanted to beat someone better than you in the Arena.
Here is a problem I have encountered with 1v1's. Sometimes, your bro's want to help you out by jumping in on the scene and get involved in your 1v1. Sometimes that's not a bad thing, but, if you really want to beat that guy, the last thing you need is for someone to invade your air space while you fight-and here's why.
It's not just a question of someone ruining your fun, there is also a technical aspect to this problem. If one of your buds jumps in, he immediately becomes an obstacle. Every time your cursor hits your buds char, or, even his name, you are going no where. That is to say, you can't move if your cursor is on top of your buds name or char. To me, this is very frustrating because the chances are, my 1v1 opponent has hit me several times while I am trying to avoid the nutcase who is trying to help me out.

See the point? So, if it's a 1v1, and players wish to watch other players and their skills, stay out of the center point of the arena, and let them get on with their thing. Go have a beer, smoke a joint, or get busy with your girlfriend, just let the fighters be. You never know, you might learn something.