These were as puzzling (especially since CBS showed no replays) as the defensive holding against Chung on the Panthers' game-winning drive. I don't really get the concept of defensive holdings on running plays by defensive linemen. How the heck does that even work?
There are two rules that could apply: Rule 8, Section 4, Article 6 and Rule 12, Section 1, Article 6. Please note that I included Rule 12, Section 1, Article 5 because it specifically is referenced by Article 6.
RULE 8, SECTION 4, ARTICLE 6. DEFENSIVE HOLDING. It is defensive holding if a player grasps an eligible offensive player (or his jersey) with
his hands, or extends an arm or arms to cut off or encircle him.
RULE 12, SECTION 1 ARTICLE 5. LEGAL USE OF HANDS OR ARMS BY DEFENSE. A defensive player may use his hands, arms, or body to
push, pull, or ward off offensive players:
(a) when he is defending himself against an obstructing opponent while attempting to reach the runner
(b) when an opponent is obviously attempting to block him
(c) in a personal attempt to reach a loose ball that has touched the ground during a backward pass, fumble, or kick
(d) during a forward pass that has crossed the neutral zone and has been touched by any player
Exceptions:
(1) An eligible receiver is considered to be an obstructing opponent only to a point five yards beyond the line of
scrimmage unless the player who receives the snap demonstrates no further intention to pass the ball (including
handing off the ball, pitching the ball, or moving out of the pocket). See 8-4-2–3 for rules applicable to Illegal Contact
with an eligible receiver.
(2) See 8-4-5 for rules applicable for an Illegal Cut Block against an eligible receiver.
RULE 12, SECTION 1 ARTICLE 6. DEFENSIVE HOLDING. It is a foul for defensive holding if:
(a) a defensive player tackles or holds any opponent other than a runner, except as permitted in Article 5
(b) during a punt, field goal attempt, or Try-kick attempt, B1 grabs and pulls an offensive player out of the way, allowing B2 to
shoot the gap (pull-and-shoot) in an attempt to block the kick, except if B1 is advancing toward the kicker