I read my rules book. 2-17- 3a specifies offensive linemen may clip , 3b against defensive linemen , 3c contact is in the zone.
casebook 2-17-2 situation D - All linemen may block below the waist as long as they are in the zone & on the line at the snap. This is supported by rules book 2-17-2.
Defensive linemen - A) cannot block in the back ; B) cannot clip ; C) can block below the waist
Thanks for the heads up on the legal block in the back. Case book 2-3-2 situation b (comment). The situation describes offensive blockers but the comment talks about a blocker not being able to stop his charge when his opponent quickly turns.
As a newcomer to officiating I must say the rules and case books have it all but boy it ain't easy reading
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