Dual opposing spirals is not explained by anatomy trains, and fascia and meridian theory alone will not offer much help. No PT, Doc, Acupuncture therapist or otherwise I have met can do it based on ANY prior knowledge of the human anatomy. It is however fairly simple to lay out, you can feel it in others who move this way well and you can feel yourself doing certain portions. It is the end product of training to use the entire body organized in a different way. Very hard to understand in the body at first ...it takes time.
If nothing else it gives some scientific backing to what appears to be happening or at least how it could be happening, which is interesting in its own right. Especially when you start getting some connection in places where you don't really have muscles to flex to connect your body.