Diagen seems infatuated with his own physio-psychologicial, overly verbose, concepts. I think we mostly do not understand where the heck he's coming from, other than expressing his ideas in complex literary tag phrases (sounds kind of cool there)
Diagen, how have YOU conquered fear and trained for a true life and death struggle?
IMO, you conquer fear by denying the danger or risk. But life-death combat is inherently dangerous and risky. To deny this removes the incentive to fight like hell with vigorous offense and defense.
One should accept the fear, along with the danger and risk. By embracing this, you now have a handle on the spiritual side of combat and can put your full energy on the mental and physical aspect - that being landing disabling attacks, without taking one, and continuing to do so until the opponent is crushed.
It's quite simple - but not necessarily easy (or even possible for some who have become too domesticated to be responsible for their own survival.)
"How have YOU conquered fear and trained for a true life and death struggle?"
I lived for years in fear and treating things not life and death as life and death.
Imagined for years that there was someone around every corner so would check with my balance and footing adjusted with flashes of weapons flying towards my eye or torso sort of flash-blinding my mind from mental sensitivity due to exhaustion and heightened sense imagination if it's close range or someone stepping out or hiding in shadows, or animals in places or charging me and in all this tensing the body in the ready for the counter with adrenaline and somesuch pumping and getting viscerally aggressive.
Imagined my chair would break and the splintered wood would jam into my body and organs; always kept aware of center of balance and weight distribution and kept feet on the ground and or arms positioned a certain way; or kept my body dense by some process I can't explain but let's me shrug off hits to torso and has a certain sensation associated with it so I can manage to do it; not entirely consistent but would stressfully go back to keeping balance or dense very frequently. I think the dense feeling was the organs being positioned right, muscles in a strong state, and internal pressure consistence.
Performed physical challenges with no preparation. This might be more misery. I exercise with fear of destroying my body and fear of snapping my neck when doing handstands though, and deal with and conquer it.
Take conspiracy theories seriously and still don't believe the world is a safe place and that there's no way to verify if what is considered true (common narrative) is true, or that conspiracy theories are false. Equal possibility and I believe many things are generally true like that p. Edo is absolutely prevalent and executives and our shoguns are involved to a decent % (even if it's 5% with another 5 - 10% knowing about it that's insane). Spent years seeing the world as a terrible place and still do but am not actively looking into it the last year or so. Mass surveillance is BIG. Corporations do it, government, random foreign governments, hackers for syndicates, lone hackers, it's everywhere man.
Looking at nuke footage and thinking about any apocolyptic scenario semi-regularly with earnest expectation. Small scale horrors that can be local like rioting and the fall of civility as well.
I guess there's more. I'll remember later.