I calculated an insane acceleration from the above video.

It takes him 0.25 seconds to turn one revolution at the peak spin (measured from the video I downloaded), or ω = 1/0.25 1/s x 2 π = 25 rad/s

The radius of the spin for the head is about r = 0.5 m (at least).

So, the acceleration is:

a = r ω^{2} = 0.5 m x (25 1/s)^{2} = 321 m/s^{2}

what dividing by the acceleration of gravity of 9.8 m/s^{2} is 32 G !!!

That is letal if it lasts a little bit! He was lucky that he only passed out.