There are a couple of things I found interesting about this that I would like to share. This is my opinion, but it is built on over 15 years of combatives and martial arts training, mainly in Filipino Martial Arts. Please bare with me as I tend to get a little long winded about this stuff.
I have to say that the video was very honest and true. First of all the video was called "knife defence in martial arts is a myth", yet half the video was taken from a dvd on filipino martial arts knife handling and defence. So maybe the video should have been called "most knife defence in martial arts is a myth."
Also most of the scenarios showing the minimum distance to access a gun was very important but probably not new to any of us who have practiced FMA or any form or reality based combatives for any length of time. The important thing to consider is that many criminals, if not most criminals will try to get close to you before they attack. They will charm, sneak, weazle, beg, lie, and cheat there way close to you to close the distance and take you unaware. If you are not in the habit of being real assertive about your distance with strangers they will
close the distance with you before they attack.
This is why it is very important to listen to your intuition about people and always be aware of their hands at all times if they are closing with you. If they feel wrong you need to be able to tell them to back the **** off! You will look like an **** to the uninitiated but to the criminal you will look like a hard target. He will likely move on.
unfortunately since we live in a culture that allows people to close the distance with us on a daily basis you may not realize things have gone awry until the bad guys are right in your face. This sucks but it is the reality of living in our modern world.
The main thing to realize is that the best you can do empty hand against a knife is make distance. If that is not possible then you must work for damage control while trying to either destroy your attacker or making distance to access a weapon. The idea of staying close and fighting a knife wielder is very dangerous thinking even if you are highly trained but unless you are omnipotent you just may not be able to choose your battle ground or what weapons are available to you. This video does a great job of illustrating the dangers of a knife fight, however hard realistic training and good tactics can allow you to survive a knife assault. Some martial arts and martial artist do teach this.