Show me where the “rule of reason” is incorporated into the NFL rulebook as a whole or in this particular rule. Does the “rule of reason” also apply to helmet to helmet tackles or technically illegal crackback blocks, as well? if there is a rule of reason that applies generally, then every rule is subject to the referee’s opinion on any given play, right? I guess this would also apply to play clock violations too, because who cares about a second or two during an NFL game, right?