BJJ Black Belt Instructor jailed for shattering student’s jaw because he thought he was slacking off

Sergio Robalo, an expert jiu-jitsu fighter and a black belt instructor, shattered a man’s jaw because he was unhappy with his student’s work ethic in a martial arts class has been jailed for two years. Robalo lost his temper with Graham Jenkins because he thought the student was slacking off during a training session in…