Hmmm, chinese, mandarin, ninja, 7th dan karate; the story is a bit confused. Nevertheless, the results speak for themselves.
http://www.news24.com/SouthAfrica/News/Ninja-58-beats-up-3-muggers-20100512
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http://www.news24.com/SouthAfrica/News/Ninja-58-beats-up-3-muggers-20100512
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'Ninja', 58, beats up 3 muggers
2010-05-13 07:55
Nelspruit - Three muggers were "taught a lesson" when they tried to rob a 58-year-old man in Nelspruit on Tuesday.
Willie Botha fought back so ferociously that his attackers ended up in hospital.
...
"Back then I was trained by a Chinese instructor in Benoni and I obtained a seventh dan in karate. I also speak fluent Mandarin."
During the "flash fight", as he describes it, he punched one of the attackers so hard that his jaw was dislocated. Botha then kicked him between the legs for good measure.
Botha was able to get his hands on a piece of wood, which he used to teach the second would-be robber a lesson.
"The third guy started running when he saw his buddies getting a hiding, but a passerby caught him and gave him a proper hiding as well!"