I like the way you think, and clearly you do have a lot of martial arts experience. Very smooth.
I noticed that you didn't fight the strength of his arm/body, and just let the weapon glide on by. I see the good in this, but I also see the bad.
I always try and let the bad guy's body do what it wants to do, instead of trying to make his body do something unnatural. However you are violating one of the basic principles of weapons takeaways, by letting the blade pass through your center of mass.
If instead of a box cutter the suspect was holding a butcher knife in the ice pick grip, a base ball bat, or a sword, you would have quite possibly gotten cut or hit, buy letting the weapon pass through your center of mass.
Why not try something like the SPEAR System? This is a quick, almost reflexive response, that would work against all of those weapons, and wouldn't require the weapon to pass through your center of mass(which as you know, contains all of your vital organs).
I understand that there is a time to let the weapon pass by, but I think that you are at too close of a range for this technique to be effective every time. In other words, I like parries, but I think that at the range you are at, a block would be much more appropriate.
Don't get me wrong, I think the technique could work. You do make it look easy, but I certainly wouldn't recommend it for somebody who doesn't train all of the time.
Don't be offended. I like reading your posts. We also have so much more in common that we have differences. Just my thoughts on it. :
Not offended at all, the idea was to show that MCS is principle based and that you can arrive at the same situation by air, land or sea. I was not trying to show a particular technique against a specific attack. Only that the open hand, stick and knife could be used in much the same way and that you can transition to a firearms but only if you can create time and distance. We have something called the panic push which we will be doing a clip of soon. Thanks for the kind words.
The problem is finding the open minds. What I do is principle based allowing you to bridge to previous training. Too many traditional MA's fail to mimic the realities of real life attacks. Glad you like it.