Basically they are excited about a guy who chopped his arm during a martial arts ritual. I've been blogging about this stuff all year. Here are a few back posts:
The Real History of Martial Arts and Trance
The Origins of the Boxer Uprising
What David Mamet Understands
Basically it's all performance, even if sometime in the future it might be the thing that saves your life. But even if it does save your life you won't know for sure that some other factor didn't intervene. Perhaps your attacker slipped, or better yet he had a flashback to a Flintstones Episode he saw when he was nine and forgot to keep killing you.
Here is a real video! One that demonstrates why the greatest performers are also the greatest predators! (Watch the whole thing, it keeps getting better.)