Knowing what you intend to do, and accomplishing it are two different things.

I've seen a few targets missed in my day. It's usually a result of stopping the gun.

However you intend to shoot the target, whatever it is, you have to actually do it. Follow through is required on every shot, and lack thereof is the reason for a very high percentage of missed shots. Sometimes, of course, we just read the target wrong - but... as a wise old shooter once told me.... "If you're ahead, you have a chance. If you're behind, you have no chance."

"The price of good shotgunnery is constant practice" - Fred Kimble