Interesting story so far, but that Sensei should have his credentials stripped. Having someone spar the first time they set foot in a dojo is totally irresponsible. I'm far too clumsy to practice martial arts, though my partner of nearly 20 years, is an advanced black belt in Taekwondo from the Korean Kukkiwon. He also has significant credentials from other martial arts, including Karate. Before posting this, I reviewed my comments with him. He agreed it was preposterous, but added that it was "only a story".