a. Use of Hands. A teammate of a ball carrier or a passer legally may block with their shoulders, their hands, the outer surface of their arms or any other part of their body under the following provisions.
1. The hand(s) shall be:
(b) Inside the frame of the opponent’s body (Exception:When the opponent turns their back to the blocker).
Approved Ruling 9-3-3 VI. A2’s hands contact defensive player B2’s back when B2 spins to avoid A2. A2 keeps his hands on B2’s back while B2 advances toward the passer. RULING: Legal block.
Approved Ruling 9-3-3 VII. A2’s hands contact defensive player B2 when B2 spins to avoid blocker A2, whose hands then contact B2’s back. After A2’s hands lose contact with B2, A2 advances and pushes B2 in the back. RULING: Illegal block in the back. Penalty—10 yards. Enforce at the previous spot if foul occurs behind the neutral zone (Rule 2-3-4). Safety if the foul occurs behind Team A’s goal line.
PENALTY—10 yards Penalties for Team A fouls behind the neutral zone are enforced from the previous spot. Safety if the foul occurs behind Team A’s goal line [S42].