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It’s a substantial change,” McKay said. “Lowering their head, creating a different spine angle, and delivering a blow . . . we need to protect all players at all times and say that technique is not allowed. So if you lower your head to initiate contact and you initiate, it’s a foul. . . . It’s one of the most dangerous techniques there is, but yet we’ve allowed it to creep in and it’s now very prevalent. And we need to get it out. And we’re not going to get it out by saying, ‘We need to teach it better,’ we’re going to get it out by penalizing it.”