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vinff 发表于 2012-10-20 14:12
膝盖触底了即便自己摔倒也不能跑了吧(抄截除外)
NFL应该是可以的,NCAA不行。
维基:
down by contactWhen the player carrying the ball touches the ground with any part of his body other than his feet, hands, or arms as a direct result of contact with a player of the opposing team. In professional football a player must be down by contact in order for play to stop; if he trips and falls without being touched by an opposing player he is free to get up and continue advancing the ball. Exceptions to this rule that result in play stopping include when the player carrying the ball is on the ground but not downed by contact (e.g., after tripping and falling) and is touched by a member of the opposing team while still on the ground; or when the player with the ball intentionally kneels down or throws himself on the ground and stops advancing, e.g., a quarterback kneel or touchback. This rule does not apply in collegiate and high school football, i.e., a player need not be downed by contact at these levels in order for play to stop. |
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