Re: The Most Essential Principles of Budo: Ma'ai
My one contribution would be a different description, attempted translation of what you spelled as ma'ai, and which I usually write as mai ai as that's sort of how I pronounce it (probably incorrectly).
"effective combative interval" - see the O/P for "effective" and "combative" is obvious, and "interval" means the literal space between two combatants. We talk about it as the exact distance where I can affect my partner.... and theirs is when I am effected by them. Probably different for us both, but depending on engagement, might not be (but probably is). Mastering mai ai takes one a long, long way towards mastery of the art. Whatever art it is.