NFL's Dead Ball rule
Rule 7, Section 4, Article 1
Dead ball
An official shall declare dead ball and the down ended:
(a) when a runner is out of bounds or declares himself down by falling to the ground and makes no effort to advance.
Rule 7, Section 4, Article 1
Dead ball
An official shall declare dead ball and the down ended:
(a) when a runner is out of bounds or declares himself down by falling to the ground and makes no effort to advance.
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