“This is the mount position where the man on top is sitting on the other man’s torso having passed any guard he can put up with his legs thus assuming a very advantageous position.”
With a little practice, it is not too difficult to roll the top guy off and be on top of him, wailing on him.
That’s a sweep^^
Just a simple buck of the hips when the opponent has leaned slightly too far forward, then hold his neck down to your head at an angle, a quick reposition of your legs then a roll, and it is you on top.
But, just based on his looks and demeanor, I don’t think Zimmerman is familiar with such techniques.
Even without sweeping, the lower man could grab and crush testicles or even insert both thumbs into the eye sockets...or just shoot the guy in the heart.