So, player 1 and player 2 are god mode to everyone else but those 2 players, so they can damage each other.
This sounds kind of pointless to be added imo. Why don't you make a private room and do a warming up?
Plus, this feature might be used in wrong way to annoy other players. For example, you killed player 3 and you command/fight to 1v1 player 2 just to avoid death from player 3.