I have had moderate success with the bump-and-roll during heavy sparring. At the time, I was sufficiently rehearsed to switch quickly to a shrimping maneuver if the guy on top was ready for it.
I was also fighting regularly as a kickboxer back then, and was fortunate enough to go to a school that did mixed martial arts before the UFC existed.
And I found it moderately effective.
At that time, I sparred two hours a week and could do twenty pull ups.
I would be worse at it now.
Zimmerman, as I said on about day two after the incident, pegs my weirdo meter.
But the odds of a guy who doesn't fight, and specifically sucks at trying, getting very far against a younger, stronger, more aggressive, more athletic individual probably aren't great, even if he hadn't had his head smacked off the sidewalk.
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