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9-1-11 a-c and 9-1-13 all address different situations. 9-1-13 prevents players other than the ball carrier from hurdling OVER an opponent, 9-1-11-a prevents defenders from jumping ON an opponent, 9-1-11-b prevents defenders from getting a running start and then jumping and landing on an opponent when trying to block a kick, and 9-1-11-c prevents defenders from jumping and landing on the "punt shield" you see in 11 man games. All four serve their own purpose.