Many years ago I discovered an article written by John Perkins. I believe he was/is a karate instructor in New Jersey. He was very accomplished in his craft and was teachings rookie cops who had just gotten out of police academy. They had been taught the skills of a policeman but there was an ingredient that could not be taught at the police academy and that was how to train your mind to act in an immediate situation of dangerous chaos. The article was entitled “Think and Prepare Like a Warrior”. I believe he has written a book on self-defense and not the easy stuff taught by your local YMCA or gym. It is quite hard core.