Quote:
Originally Posted by Bullycon
The defense may not give signals that interfere with the offense's signals. (e.g. a DL yelling "Hut!") That results in a 15-yard Unsportsmanlike Conduct penalty. Other than that, there are no restrictions on who may call verbal signals.
The offense may be penalized for a false start if they commit any act clearly intended to cause the defense to encroach. A player yelling "Set!" would not normally qualify.
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This is also the Canadian ruling, with the exception that it's a 10-yard OC foul.