American Football IFAF Approved Ruling 9-1-10:V

V. After snapping the ball, snapper A54 brushes by nose guard B62 on his way to block a linebacker. A54 makes slight contact with B62, or B62 reaches out and uses his arm to initiate contact with A54. While B62 and A54 are in contact, right guard A68 blocks B62 at the knee from the front. RULING: Legal. A54 is not blocking B62. The incidental contact or B62’s initiating contact does not constitute part of a combination block, and hence there is no chop block. [Cited by 2-3-3, 9-1-10]