Too many people don't understand the rule. You have to maintain possession all the way, even after you hit the ground. Remember our win at the Liberty Bowl? A Memphis defender intercepted Kyle's pass in the end zone, fell down, rolled completely over, and only then did he lose the ball. Called an interception, but replay overturned, which was the correct call.
Exact same scenario as the Iowa incompletion yesterday. I see several hit Disagree on my earlier post but the rule is consistently applied as I have described, which is exactly as the rule is written.