Scrum (rugby) the players who are designated forwards binding together in three rows. The scrum then 'engages' with the opposition team so that the players' heads are interlocked with those of the other side's front row. In rugby union the initiation of the process is verbally coordinated by the referee who calls 'crouch, bind, set' as of 2013 (formerly 'crouch, touch, pause, engage', 'crouch and hold, engage' before 2007). The scrum-half from the team that did not infringe then throws the ball into the tunnel created in the space between the two sets of front rowers' legs. Both teams may then try
Referee as the Snitch Referee. The Head Referee is also assisted by a scorekeeper who keeps track of match time, penalty time, goals scored, and time of Snitch snatch. The game of roller derby is governed by a team of up to seven skating referees. (Only three are required due to the grass-roots nature of the sport, though the full seven are used whenever possible). The required referees are a head referee, who oversees the running of the entire game and has final say in any disputes, and who doubles as an inside pack referee, following alongside the main pack of