if it's not in the muscles, then it's inaccurate. Like the four humors don't literally exist but the idea was successfully used to treat ailments for years. It's also entirely wrong, based on limited understanding and promotes a high degree of misunderstanding in its idea and verbage.
Human language does not always work that way. The meaning and understanding of words can change and we can use the word even if we know that the cuttlefish is not really a fish. It is still there. And we still use the word even when we know it is not a fish. We can use the proper Latin name for it if you want but nobody does and nobody recognizes it except for a few scientists that study the animal.
The generally accepted term for the thing is muscle memory, maybe not memory of the muscles but memory for the muscles or about what the muscles should do but that is still the term and until somebody comes with a better term it stays.
And there is a clear difference with the four humors. The four humors do not describe something that happens and needs an explanation, they are an explanation for something that does not happen. They are a unicorn, not a cuttlefish.
So get a new word for cuttlefish if you want but until you do I have to assume you think the animal does not exist which is plainly absurd.
but despite my own limited training with guns I know this, and I mean I know it like a principle I've always adhered to any time I've held a gun. This is why I don't think it was merely lack of training. General breaking down of the psyche and ones beliefs and principles might have such an effect though, as the mind tries to realign itself under a new banner. Someone convinced him Harry and Murphy were monsters.. perhaps his mind was thrown into chaos and was trying to wrap itself around the new status quo?
I still remember a time when Rudy threatened Dresden if anything happened to Murphy... Him going on to point a gun in her face ready to blow her away is definitely a mental dissonance. Something happened to change his mind, if not an actual psychic attack then the slow eroding of his mind from more mundane 'mind expansion'.
You know it but when you move you have to think about it. That is not enough for a properly trained person.
It is like me playing the piano. I know what key is what note and I can read notes from a score but that does not mean I can play the piano. I do not know how to do it properly. I have to think where to put my finger, I can not just hear the note in my head and get the right key immediately and so on.