Here's an idea...
... that you guys will probably find stupid... but it makes sense to me.
With the NFL being so conscience about preventing injuries, especially head injuries, why don't they blow the whistle as soon as a flag is thrown on an offensive penalty? The play isn't going to stand anyway but it's allowed to continue (in most cases) risking injury for something that doesn't even matter. It's dead. It's over. It's going to be called back no matter what happens so why not end the play as soon as a flag is thrown and cut down on the risk of an injury happening on a non-play? It's seems both logical and responsible to me. If they really care so much about limiting injuries then stop letting people get hit when the play isn't going to count anyway.
Tell me why this would be a bad idea.