I'm interested (nervous?) to see how this is actually enforced because it seems like there could be a lot of nuance.
For example, if I'm a blocker pursuing a defender, and that defender's shoulders are squared up to me, but their head is turned and I'm technically outside their current "field of vision," will I be penalized for hitting them? I can understanding wanted to do away with the hits that happen on the side/shoulder pad area where a tackler clearly couldn't see it coming, but the language seems a bit vague.
That said, I don't rightly know or recall how many hits Nebraska blockers had last year that would qualify as a penalty now. I can't think of any off the top of my head but I'm sure there were some.