This is from the rule book:
Item 1.*Player Going to the Ground.*A player is considered to be going to the ground if he does not remain upright long enough to demonstrate that he is clearly a runner. If a player goes to the ground in the act of catching a pass (with or without contact by an opponent), he must maintain control of the ball until after his initial contact with the ground, whether in the field of play or the end zone.
Notice the wording, he must maintain control of the ball until after HIS INITIAL contact with ground. James's initial contact was his knee, and he still obviously had control of the ball.
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			Item 1.*Player Going to the Ground.*A player is considered to be going to the ground if he does not remain upright long enough to demonstrate that he is clearly a runner. If a player goes to the ground in the act of catching a pass (with or without contact by an opponent), he must maintain control of the ball until after his initial contact with the ground, whether in the field of play or the end zone.
Notice the wording, he must maintain control of the ball until after HIS INITIAL contact with ground. James's initial contact was his knee, and he still obviously had control of the ball.
Sent from my XT1585 using Steeler Nation mobile app