Originally posted by 49erWay:
Catch the ball with two feet down and its a touchdown. Play was technically over. Then the receiver was hit. In the field of play you can hit after e catch. Not in the endzone.
The play is not over if two feet touch the ground with possession. The play is over when after you hit the ground, you maintain control of the football throughout the entire process of the catch. Ask Calvin Johnson for the details of that rule.