Having had someone try to stab me in the past, semi-successfully, and also having spoken with several other people involved in altercations with edged weapons I can honestly say that in my opinion this video is a joke.
Some things to remember if you're ever in a "knife fight".
#1: You're going to get cut...
#2: See rule #1...
Heck, the police catch a lot of bad guys because they find blood at the scene of a stabbing that did not come from the victim. I.E. even though the BG was the only one with the knife, they still managed to get cut...