This is one of those tricks I've seen and lusted after for the past year--I finally had the chance to put in some concerted work on it and it wound up not being as hard as I feared. The most important insight when it comes to this move is realizing that it's essentially a body tracer performed as a contact trick. Once you've got that part down, the rest fits together easily.
You are missing some Flash content that should appear here! Perhaps your browser cannot display it, or maybe it did not initialize correctly.