This is the writer of the movie. LOL!!
"I had known Frank Dux for a number of months before I came up with the idea for Bloodsport. Frank told me a lot of tall tales, most of which turned out to be bullshit. But his stories about participating in this so-called "Kumite" event sounded like a great idea for a movie. There was one guy who he introduced me to, named Richard Bender, who claimed to have actually been at the Kumite event and who swore everything Frank told me was true. A few years later this guy had a falling-out with Frank, and confessed to me that everything he told me about the Kumite was a lie; Frank had coached him in what to say."