I've been snap shooting for 49 years. Didn't start that way, but at age 7 I found that to be the only way to shoot flushed pheasant.
I don't know how something as simple as the correct meaning of "snap shoot", can end up meaning uncontrolled shooting these days.
My eyes aren't quite as good as they use to be, but in my 20's and 30's I could put 5 shots into a 2" target circle before most shooters that hold and aim could execute 2 shots. I would do this anywhere from 30 yards in. And shooting anywhere from 50 to 85# bows. I don't believe this is considered uncontrolled shooting, I believe it is called practice, form and confidence. I could also easily hit the targets if I held at anchor.
But as with shooting a rifle I've always believed the longer you hold the more margin for error.
Terry, Ron, Fred and Howard have it right.
Snap shooting is accomplished by being on target throughout the entire shooting sequence there is no need to stop to aim when you instinctively know you are on target. The second you reach full draw and touch your anchor point there is no reason to hold, to do so is a waste of effort, just release.
To me it would be comparable to trying to aim a baseball in mid-throw when your mind has already done this for you.
This gets me as worked up as those who want to argue that gap shooting isn't instinctive shooting, and that a real instinctive shooter is totally unaware of the presence of the arrow when they shoot. If this is really the case it's know wonder there are so many shooters that have windage and elevation problems, and that think hitting a paper plate at 20 yards is considered good shooting.
I believe what some of you consider to be snap shooting is really being over bowed. You just haven't developed the muscles to hold at anchor or to aim and shoot quickly with good form.
Just my opinion.