I don't know. When CBS had the split screen it was clear to me his knee was down on my 75" HD screen. I wonder if the refs had that technology available to them?
I wasn't even looking for his knee. It was clear his elbow was down before the ball crossed the goal line. And in order for him to lunge forward after hitting the ground short of the goal line, he would have had to push off from somewhere, and that somewhere definitely was not his feet.
That is the point ignored by many a Bulldog.