Few people have ever strangled Mark Zuckerberg. Khai Wu is one of them.
Wu, a professional fighter known as The Shadow, has a black belt in jiu-jitsu and has used it on Facebook founder for the past few months during private mixed martial arts training. Their sparring parties occasionally include a Brazilian jiu-jitsu stranglehold. “He’s never like, ‘Don’t do that,'” Wu said. “He actually asked, ‘Can you give me a little more resistance, a little more power? I want to feel it.'”
Wu’s gym, the Guerrilla Jiu-Jitsu Academy in San Jose, California, has seen many techies like Zuckerberg come in to learn how to fight. “We call them jiu-jitsu nerds,” he said—people who don’t look like a threat until they step on the mat. Zuckerberg, a tiny 5 feet 7 inches, may not inspire fear in the octagon, but his strength is in his mind. “You would never expect these guys to be able to bring you down. Before you know it, they’ll attack you with these extremely technical moves,” Wu said. “You don’t know this nerd is a silent killer.”