Precision as an established practice originated in hunters, assassins and archers who had learned, over time, that the best way to survive was by firing one shot with precision and accuracy rather than by fighting long battles.
Hunters in the dark forest of Batesian developed their marksmanship to allow them to hit vulnerable areas on monsters that armor and brute force would otherwise be unable to penetrate.
In the shadows of the courts of Tirafel, professional hit men learned the skill of killing quietly and quickly, and over generations they merged the different styles of hunting and killing into what it is now.