This is akin to the Akibudo Kobudo teaching called "Sword of Death, Sword of Life." "Bringing death" as you put it Yerik, is only one of two possible outcomes. The sword can also save life, if used in honorable defense of life, and not wielded to hurt or maim. Even Musashi gave up fighting to become a Buddhist monk, and he fouught no more. He had moved from a travelling duellist (sword of death) to a monk sworn to serve others with his very being (Sword of Life).
This duality of nature resides in all things. Fire can preserve life (Cooking food, providing warmth on a cold night, light in the dark) or bring death (forest fires, house fires, destructive fires). Cold can preserve food which maintains life, or it can take life (exposure, hypothermia, frostbite, etc).
One could look at the new developments in police non-lethal force Tech as a change from "Gun of death" (Kent state, etc) to "gun of life" (tasers, pepper spray, stun guns, rubber bullets, etc)
There is much much more to this secret teaching, I cannot hope to fully understand it, as I am no master! Folks who master this teaching (and there are a few alive today) can catch a sword blade, disarm an opponent in a flash without injuring himself or the agressor, catch arrows, (and that is just the physical reflection of a deeper and more profound mental and spiritual enlightenment.)
What were we talking about agin?