ISTR a discussion here of this one a few years ago. IIRC the consensus was that IUH (illegal blocking) would be correct in cases where the hands or forearms slipped upward during blocking, personal foul in cases where the head or neck was the initial contact point, but no foul by a ballcarrier fending off a tackler unless it looked like a gratuitous head shot -- even though the rule book has no explicit exception allowing above-the-shoulder contact for stiff arming by the runner.
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