not sure if it was or that it matters on a screen...
" 4. A defensive player may not tackle or hold an opponent other than a runner. Otherwise, he may use his hands, arms, or body only:
(a) To defend or protect himself against an obstructing opponent.
Exception: 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 clearly demonstrates no further intention to pass the ball. Within this five-yard zone, a defensive player may chuck an eligible player in front of him. A defensive player is allowed to maintain continuous and unbroken contact within the five-yard zone until a point when the receiver is even with the defender."
I assume that TKO just gave him one hell of a "chuck".