I think the Tueller drill taught me that you need to be moving in a fight. Any kind of fight. Once somebody starts running at you with a knife, you need to be drawing, moving, and shooting. That’s why I think magazine capacity, and always carrying an extra magazine is important.
The Tueller drill also really solidified to me that in a self defense senario, you will probably have holes in you as well.
Finally, I have taken all 3 levels of the Army combatives course. The instructor was an Army Ranger who was in the 75th Ranger Battalion. He killed an Al Qaeda militant with a knife, and basically said that it is super hard to kill a person with a knife, because you have to basically use the knife like a lever against bone to cut somebody bad enough to stop them in one go. Which means using a bigger knife. A bigger knife with a fixed blade.
Also from my experience making knives and breaking store bought ones, you really have to make sure what steel your knife is made from. You want something with a little lower carbon. So for instance, a non stainless steel chef knife is made from 52100 steel. The 5 designates the steel as a chromium alloy steel, the 2 means there are elements present that effect the attributes of the steel, and the 100 indicates 1.00% carbon, which is a lot. It means the knife is good for slicing, but not good for stress. I would want a steel like 5160, the five meaning chromium, 1 for other elements, and .60% carbon. 5160 used to be used for a lot of leaf springs on vehicles. I personally use that and 8670 for all bushcraft knives that take a beating. O1, W2, and A2 are also good for a knife that can take a beating. D2 is a type of steel that a lot of knifemakers frown on, because there are better and cheaper options.
Boy, that was some long and drawn out knife nerd stuff. Anyways, just make sure you get a good steel on any knife you have for edc.
edit, We’re out to stop threats, not to kill. So my vocabulary about my Army training wasnt spot on for our circumstances, but it provides a visual of my point, that it’s hard to stop somebody with a knife.