Ok here goes...

Demo Settings
Hold All [c]
Contract Pecs
Raise Shoulders
Contract Abs
Extend Hips
Contract Knees

Space x 1

Contract Hips
Lower Shoulders
Grabby Hands

Space x 1

Extend Knees
Press [p] , or do as you wish

Voila!If done correctly , should rip off uke's head and at the same time kick off his both legs from the knees.
Here's a replay

Heh. nice and simple