I did used to run the street as an undocumented pharmacist, I did club and hospital security, and spent a little time over the years training crowd control scenario drills for years.This seems like its in a similar vein to just "punch them". Which as far as i can ascertain is part of any good weapon defence system, bind the weapon then just punch the **** out of them.
Most of the time it boils down to context and the other person messing up. Like if you watch some shiv works force on force, its throw a distraction in there then secure the weapon and deployed your own. (they work with the context everyone has a pistol and knife) I dont really know what would and wouldnt work as testing and the metrics for testing are as important as the thing itself. Along with cons on the testing form.
Worth noting best ambush defence is seeing it and not walking into it(or counter ambush), so i wish people would acknowledge that and spread that. You cant win from a ambush usually, it just boils down to just hitting until you die or get out of it.
Some is skill, some is training. But in the street, awareness and luck go a long way.