How is Spirit of the Game applied to Ultimate Disc?

Spirit of the Game: Ultimate relies upon a spirit of sportsmanship that places the responsibility for fair play on the player. Highly competitive play is encouraged, but never at the expense of mutual respect among competitors, adherence to the agreed upon rules, or the basic joy of play.

Explanation:

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A truly unique and defining element of ultimate, Spirit of the Game places the responsibility of fair play solely on the athletes themselves by requiring each player to know the rules and make their own calls, without the help of a neutral official.