If you freeze it frame by frame it does not look like the head was the primary point of contact.
It does look shoulder to shoulder IMO from that angle. What I would coincide to is that it is a blindside hit. MacArthur didn't see it coming and had his body in a valurnable postion. Sieloff should have backed off during a scrimmage. I think he could have made a decent hit there but didn't need to put him through the boards.
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