I think... It was set up so that there were no buffers, debuffers, healers or mezzers. I think dark melee and some power pools were also off limits. The blasters were like the quarterback in football, the scrappers like runningbacks and the tankers like linemen. The scrappers and tankers who were on the same team could not choose the same sets. It was fun because it was damage vs damage with some minor secondary effects.