American Football IFAF Approved Ruling 9-3-3:VI and VII
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 forward passer. RULING: Legal block. [Cited by 2-3-4-a, 9-3-3-a-1-b, 9-3-3-a-2]
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 the foul occurs behind neutral zone (Rule 2-3-4). Safety if the foul occurs behind Team A’s goal line. [Cited by 2-3-4-a, 9-3-3-a-1-b, 9-3-3-a-2, 9-3-6]