My swing-coach or guru Niq (follow his posts here or on reddit here has put together an amazing breakdown of what the proper snap motion is and I wanted to share it. Snap is so hard to capture on video because it happens so quickly in a short range of motion but here is an early version of his image that is a current work in progress.
Niq has helped me understand all of the technical aspects of the throw and is almost solely responsible for me finally being able to hit 450′ so I highly recommend you reading as much as he has to write.
Please let us know if you have any feedback on this image. Questions or comments are always welcome and will help evolve this into something useful for more folks.
You can follow along with the conversation on this image at this DGR thread