Re: Extending Ki.
I believe as soon as you start trying to frame it into what it is or isn't you have lost the concept. Certainly you are entitled to interpret based on your own experiences. It is not for me to say it did or did not happen.
Keep this in mind, why limit yourself to the mechanical aspects of human anatomy/physiology?
Energy or KI prevades all things. So it has much more meaning than a physical manifestation and a literal interpretation.
I'd personally focus on not so much trying to figure it out, than to simply experience it and learn.