No idea if this is new or old, but I've been using it as an opener on the demo classic server, and it does it's trick nicely.

Hold all
Contract both pecs
Lower left shoulder
Raise right shoulder
Space.
Raise left shoulder
Lower right shoulder
Extend left wrist
Grabby hands
Space. (Crunch)
Extend right wrist
Relax left wrist
Ungrab left hand
Space (Crunch)

Obviously you're unlikely to get the arm rip AND the decap on a player target, but you're normally in a fairly good position for it by then, and by working with the ankles and hips, you can normally get one of them to work.

Comments? Advice?

wow - fast and effective move - good job