In relation to the Shazier/Bernard hit...
Watch this week's officiating video
http://media02.nfl.info/NFL/Media/2015/Video19/Officiating_Media_Video_01-15-16.mp4?_=1According to Blandino, it isn't spearing because they were moving in different directions (excluding heading straight for each other). That's a new one on me.
So I looked up the rule and it says...
"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.
Note: The tackle box no longer exists once the ball leaves the tackle box.
Penalty: Loss of 15 yards. If the foul is by the defense, it is also an automatic first down. The player may be disqualified if the action is flagrant."
Not sure where to find the NFL ARs, however that would seem more than just an interpretation to add an "AND" with a whole extra condition.