Forgive me if I just don't buy it.
I grew up in a fairly "nice" neighborhood but there were stabbing, shooting and fights.... the first thing I ALWAYS did and would do is start backing up and always look at hands.... ALWAYS.
It only takes getting hit once with a combination lock tied with a handkerchief swung out of a back pocket to make you very wary. I "bump" into somebody I don't know, I apologize... if they bow up and start looking to "be respected".. then it's coming. So I start backing up and if I'm carrying in my back holster, I pretend to adjust my pants and back away apologizing . If he keeps coming into my bubble then I keep backing up and look at the hands....
Always look at the hands, cause the the face can lie, the body posture can be controlled but make sure you look at the hands...
I think that maybe if I was within 15-20 feet I might have taken one stab wound, but I hope that I'd be able to draw and put at least 5-6 rounds into his chest from 2 feet away as he stabbed me....
Killing somebody with a knife is an up close and personal way to do it... it's always nice to keep distance.. might just give you the tenth of a second you need to defend or escape.
Dude, if you had to worry about that stuff, you didn’t grow up in a nice neighborhood.