Live performance is a system of interlocking skills honed individually and together over time like any other muscle-building, and then deployed all at once. It is almost always desired that the edges of that displayed set of skills are folded under and invisible to the uninitiated, and, on the highest level, even to fellow initiates. So as one progresses, craft becomes more and more opaque. The skilled stop understanding how and why they do it and the very best seem to require no effort at all.