Page 12 in the 2007 Casebook covers this.
2.17.2 Sit. E: A1 is in shotgun formation (scrimmage kick formation) lined up 7 yards behind the LOS ready to receive the snap. Immediately after the snap to A1, (a)A2 immediately drops & blocks B1 below the waist of (b) A2 rises, and slightly retreats as if to go in traditional pass blocking protection but then dive & blocks B1 below the waist. Both A2 & B1 were in the zone & on the LOS at the snap & contact happens in the zone.
RULING: Legal block in (a) & illegal in (b). It is legal for A2 to block B1 below the waist if the contact is made immediately following the snap when the QB is in shotgun. Any later, the ball is considered to have left the zone & the block is illegal.
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