Rule 12 Player Conduct
Section 2 Personal Fouls
STRIKING, KICKING, OR KNEEING OPPONENT
Article 1 All players are prohibited from:
(a) striking with the fists;
(b) kicking or kneeing; or
I believe there is sufficient evidence to conclude he was intent on sticking his cleats into Reed's knee.
I'd hate to see a league full of kung fu sliding quarterbacks.