DM_Manager is used to transition between rounds. You use 'doroundtransition' to determine a winner and start the next round. Unlike using the 'teamwin' command, it will also considers a draw as a possible outcome. There's also a 'finishroundtransition' command which you can use to force a transition to the next round without determining a 'winner'. Both commands may change the level to the next one in the rotation once sufficient rounds have passed.