Heres how it happened. I was in a four player game, and someone changed their color RIGHT as the map started. As a result, there were two red players (Who did attack each other) on the same FFA game.
If it matters, this was a game on "The Holy Tree" in domination.
I don't think so. Dedwinia does its own colour checks and should have rearranged one of the two players to a different colour just before the game started and ignored colour changes afterwards.