'David Yudkin said:
My concern is if the refs start waiting to blow the whistle until a play is completely, totally over and then sort things out is that some players will think the play is over while others may not. That concept will last until someone gets absolutely destroyed thinking that a play is over and ends up going on IR because it looked like a clear incomplete WR screen pass while the defense kept playing and lit up the receiver. I would hope that most people would rather see an occasional blown call than guys getting hurt.
Play 'til you hear the whistle. That's one of the first things you're taught as a kid. It keeps players from thinking and allows them to just react. It also is in the best interests of safety, since everyone should be alert through the end of the play, which is denoted by the whistle. Why would blowing the whistle later cause anyone to let up earlier and risk injury?
If you are the WR or a RB on a screen pass and you know for a fact that the ball was thrown in front of you, you would not be bound to jump on an incomplete pass (whistle or no whistle). A defender who has not heard a whistle will keep playing. You as the receiver KNOW it is an incomplete forward pass. I really doubt you will go after the ball knowing the play is dead, while the defense will still play like it will be a live ball. Similarly, if your blockers know you didn't catch the ball and it was a pass, they won't be looking to block anyone or recover a fumble. So when a 310 DE comes and cleans their clock, they won't be expecting it even if there is no whistle.I have seen plays like this at local high school and college games, and even without a whistle being blown defenders have earned 15 yard personal foul penalties for hitting guys that were not expecting to get hit when the play after the fact was ruled incomplete.I suspect that if Tom Brady throws what he truly believes is an incomplete pass and not a fumble yet the defense plays it as a fumble and Brady gets crushed and injured the league would go nuts over that.