Beside the 1v1 duel system,I think that Mike should add a 2v2 too.So basically that’s how it could work: I challenge someone in a duel,the duel does not start right way,but there is a limited time for like 1min before it starts,in the mean time both duelists can invite a fellow in their teams.After (if both teams have their duelists ready), the challenger can start duel (/startduel or sth).Teammates won’t be able to damage each other and the duel ends with one team standing alive.