I'm afraid I'm in agreement with InSeat19c.
Whilst we all believe we will behave in a certain manner in an extreme situation we can never be sure what we will do when faced with it for real.
I agree that reaching for your overhead belonging is, in my opinion, foolish you have to consider that perhaps these people might well be willing to risk their life and others for what's in the bag.
If you've ever seen the queues for the Indian Bullets in the UAE you would understand.
What I say from the front is irrelevant, when the sh*t hits the fan any plan goes out the window with it in the cabin! The cabin crew do an excellent job attempting to guide the herd out of the doors. They are the real heroes here.