The line judge's job is to backup the referee. if the ball is in or out and if there is a foot fault (that's my job on the Blizzards.
The up refs job is to tell the players when to serve.
The down refs job is to tell the up reff when there is a game point, when the scorers are ready to start the game, and what the team captains are.
The scorers keep the scores, timeouts, captains, foot faults, fouls and all.
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he signals the home team to serve the ball by blowing the whistle and moving his hand sideways