Just watching this video of Rickson again, showing his 'invisible' JiuJitsu. It's brilliant. The two movements are basically the same as commencement of most tai chi forms and what looks like the wu style version of crane spreads wings, with the bend forward from the waist.
http://youtu.be/DbtIPkyGm4g
The little details though.
And like yang Cheng fu, he keeps admonishing the student to relax.
P.s. Props to Jake for providing these videos, but dang I don't know how he got his black belt without knowing the defence to a rear choke....