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

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108. Where a contestant falls to the ring mat as the result of a legal blow, the referee shall clearly indicate the count by marking off each second with a motion of his arm. If the contestant is still down when the count of 10 is reached or if the contestant is on his feet but is unable to continue the bout, the referee shall indicate a knock-out by crossing his arms above his head.
O.C. 662-95, s. 108.