Went back and watched it, and it looks to me that the ball is at the goal line when the knee hit, which is a TD or impossible to reverse at the very least. The pylon cam shows he was down plenty early... well before the end zone. In fact no body part was in the end zone when he his knee was down and touched. They just showed it several times. It was close, but I don't think Lazard wasn't touched by the defender until the ball was over.