Duel System

I think it would be interesting to go to the roster and challenge other players to a duel. The one challenged, if they accept, get to make the rules from a list of options such as Deathmatch or First to Five or something along those lines. If for example, the challenge takes place in the Mothyards, then the duel will take place there and players involved wont be able to leave that area until either the duel is finished or one player forfeits. Players not involved in the duel would be able to watch the battle, but would remain unable to damage the other player. What do you guys think?