S-3.1, r. 11 - Regulation respecting combat sports

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142. Where the referee considers that a contestant is no longer able to defend himself or stand up to his opponent, he shall stop the bout and declare the opponent the winner by a technical knock-out.
The referee shall also stop the bout and render the same decision where the person in charge of the sports event, considering the contestant to be no longer able to defend himself or stand up to his opponent, asks the referee to do so.
O.C. 662-95, s. 142.