Good Block or penalty?

[mbyron]

Originally Posted by bigjohn

it doesn't say a thing about first in this description of butt blocking.

You're not interpreting the definition of IHC correctly, as everyone else has said.

Originally Posted by 2009 NFHS Football Case Book

2.20.1 SITUATION A: From a four-point stance on the offensive line, interior
lineman A1: (a) initially contacts an opponent by driving his face mask directly
into the opponent’s chest who is not the ball carrier; or (b) contacts an opponent
with his shoulder so that his head is to the side of the opponent’s body and the
helmet does not make initial contact; or (c) attempts to block an opponent with a
shoulder, but because of a defensive slant, primary contact with the opponent is
made with A1’s helmet. RULING: The block in (a) is illegal butt blocking. In (b),
even though there was some contact with the helmet, the block is legal because
the helmet or face mask was not used to deliver the blow. In (c), the covering official
will have to judge whether or not it is a foul. Because of defensive slants and
stunts, there will be instances in which the blocker attempts to make a legal
shoulder block, but inadvertently contacts an opponent with either his face mask
or helmet. When this is the case, contact does not result in a direct blow and is
legal. (9-4-3i)

In the clip you posted, everyone else seems to agree that the initial contact was not with the helmet. Thus, no foul.

It's not that difficult.