It is weird I watch a bunch of games every week and over and over they say the same things are point of emphasis, blockers downfield early, WR's blocking when the ball is in the air, and hits to the head of QB's and WR's.
All 3 of those happened to us today without a call although they did get Thielen a bit later for the same thing blocking while the ball is in the air.
But yeah Harrison Smith needs to be fined on this one and the refs need to be held accountable it's a safety issue someone has to be watching that. Aside from the penalty they probably SHOULD have forced D Hop to go into the tent to make sure he was ok but they never saw it I guess.