That, or he knows the trick of human psychology he is using to get people hooked and also knows how to make oneself immune? If you want to learn how not to get locked in a chokehold, you could certainly do worse than learning from someone who teaches people how to lock someone in a chokehold (though I appreciate there may be a better teacher who understands the art of defense as being different from offense or something, but "whenever someone does X the stuff I teach doesn't seem to work, so do X" is a pretty great starting point).