I remember back when I was about 16 a buddy and I went duck hunting down at the coast . We went to the guys house, his wife cooked us a nice breakfast, and he took us out by boat to a blind. I guess that is what you would call it, a compartment on stilts up maybe 20 feet when the tide was out.
Occassionally some of the little buffle heads would come by skimming the surface and when you shot you could see where the shot hit.
The little suckers were flying probably 50 miles an hour and I was shooting way behind them. I had a hard time making myself lead them far enough, or I may not have been following through. But, I was definitely behind them.