This feels quite connected to the void/the intention to cut, and not just for the martial arts metaphor. In the same way that someone who has mastered a martial technique sees "through" it enough to be able to modify it on the fly, a good mental stance allows me to see "through" cognitive techniques, see how they work, why they work, why they might almost but not quite work for me, how they might work better if I adjusted them just so etc.