I got my info from a book I read in my misspent teenage years. Knife Fighting Lessons From Folsom Prison, or something like that. Good info but it could have been one brief paragraph long. Keep your weapon hand cocked and inaccessible. Jab or grab. Feint, feint, go.
I read the same book when I was a kid too, Put'em Down, Take'em Out, Knife Fighting Techniques From Folsom Prison -
https://archive.org/details/pdfy-Q7Kv7FhWha9UCuZY/mode/2up .
The guy who wrote it was connected somehow to the A-ryan Brotherhood, and tried to get into police training afterward, but it fizzled out. From what I heard his advice was just along the lines of "I wade in, stab a lot, then I bandage myself up, and wait for the law and the medics." He didn't quite get that most wanted defensive measures also.
Just to make this bodybuilding related, there was another knife fighting book called "Prison's Bloody Iron" (
https://archive.org/details/PrisonsBloodyIronDeadlyKnifeFightingTacticsRevealedHaroldJenksAndMichaelBrown ) that was written with a prolific bodybuilding author of the 70's and 80's named Michael / Mike Brown.
Brown was an odd author because he'd write about bodybuilding, then try to interest people in other stuff like gasless motors, honey production, "Iron Claws" (a kung fu grip manual), and a shitload of Bible based weightlifting books - "Sex, Money and Power - The Bible Shows You How", "The Strength of Samson", and a Bible based Bench Pressing book that I forget the name of.
It may seem an odd topic, but there were a bunch of other guys also trying to mix Bible teachings with bodybuilding also around the same time, late 60's - early 80's. Most of it was Bible based nutrition, Bible based strength training, and how to manage your bodybuilding sex life, vanity, etc.... along with your religion. Ironman magazine was a treasure trove of that type of stuff, I think because Peary Rader was a good, God fearing mid westerner, and the mag always needed help to keep afloat

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I do wish I got to see a finished copy of that Bible based benching book.