About the Shadow Cast. This was developed by Jason Borger just for the film, "A River Runs Through It". The cast was actually a Galloway Back Cast fine tuned and turned forward. The purpose of it was to cast a fly upstream as far as possible while keeping the line really close to the water and not having any of the line hit the water until the fly reaches its intended target. Jason did this because Norman Maclean remembered it as the best example of what his brother could do with a fly line and to allow the camera to capture all of the action of the line and rod. Gary Borger wrote about it in his book, just for info.
As for the VooDoo Cast, I suspect it is simply a version of the Shadow but called a different name.
Larry ---sagefisher---