SanDiego49er":p2uoy71t said:
1) His legs were on top of the defender trying to tackle him. Therefore he was still falling forward and not down yet.
"RULE SUMMARY VIEW OFFICIAL RULE
An official shall declare the ball dead and the down ended:
when a runner is contacted by an opponent and touches the ground with any part of his body other than his hands or feet. The ball is dead the instant the runner touches the ground. A runner touching the ground with his hands or feet while in the grasp of an opponent may continue to advance"
He was down by contact the second his helmet hit the ground as it was the first part of his body that hit the ground that wasn't his hands or feet. It is right there in the first sentence of the rule. The divot in the ground from his helmet was a couple of feet behind the marker. That isn't my opinion, it is in every picture that everyone has been posting.