There’s video of him talking before it happened, he wanted it to happen and played it up big time. The guy appears to be a professional agitator, there is even conspiracy theorists noticing the amount of blood coming out of his ear on the camera mans side with a tube running up his back. Not saying it’s true, but he did take the fall on purpose and his body reminded him it’s not the 60’s anymore when he last tried that stunt, that’s my opinion of what happened.
That blood did come spilling out awful fast.