Yes, I'm saying that a rule that is never called should not suddenly start being called with 30 seconds to go in a playoff game. By the way, Porter wasn't antagonizing anybody while he was on the field. He was standing over by Brown talking to the refs when Gilberry came up behind him and shoved him. And you only quoted the first part of the crown of the helmet rule. Here's the whole thing:
Rule 12, Section 2, Article 8. Initiating Contact With the Crown of the Helmet. It is a foul if a runner or tackler initiates forcible contact by delivering a blow with the top/crown of his helmet against an opponent when both players are clearly outside the tackle box (an area extending from tackle to tackle and from three yards beyond the line of scrimmage to the offensive team's end line). Incidental contact by the helmet of a runner or tackler against an opponent shall not be a foul.
When Bernard ducked his head into Shazier's helmet that made the contact incidental, thus no penalty.
There was no ducking.
Wasn't there. Didn't happen.
YOU. ARE. COMPLETELY. MAKING. THAT. UP.