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Referee Signals for Defense in American Football
American Football Game-Play Referee Signals

4 NFL Rule Changes for 2013

Coaches who challenge a play that would be reviewed automatically in the replay booth are charged a timeout.

If the call is overturned, the coach gets back the challenge. The coach is still charged a 15-yard penalty if he challenges a booth reviewable play. Before this change, the coach would have been penalized the 15 yards, and the play would NOT have been reviewed.

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