Ok, I get it now. I guess the trick is to never let your guard down and always be in the "yellow zone" when you are out and about. Don't allow anything surprise you. This "yellow zone" is from a book I read a while back, it's called "On Combat" written by Lt. Col. Dave Grossman and Loren W. Christensen, it's a collection of researches based on how body and mind function while under the stress of combat. Here is a chart from the book that explains zones of "arousal": https://pic8.co/sh/WlvXJv.png There is a whole chapter on that in the book so I can't be covered in this single comment, but I would highly recommend you get it and read it, as it will give you a good answer to the question you asked. This is part of the description what book is about: >On Combat looks at what happens to the human body under the stresses of deadly battle the impact on the nervous system, heart, breathing, visual and auditory perception, memory - then discusses new research findings as to what measures warriors can take to prevent such debilitations so they can stay in the fight, survive, and win.