Rules Analysis
World Flying Disc Federation 2017 Rules of Ultimate
15. Calling Fouls, Infractions and Violations
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15.9.
9
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After a player initiates a stoppage incorrectly, including after mishearing a call, not knowing the rules, or not making the call immediately:

If there is disagreement over who initiated the stoppage incorrectly, then the disc should be returned to the last non-disputed thrower.

15.9.2.

if the opposition does not gain or retain possession, the disc must be returned to the last non-disputed thrower.

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