Well, I think Endlessness here is not being "on the defensive". He is simply sharing his point of view in order for the conversation to expand. A dialogue wouldn't be one if there was only one opinion repeating itself.

You are pointing out how the scientific oriented people on this forum are being skeptical, but we could argue that others here lack critical thinking. I think the good balance would be skeptical but open minded, wich is what Endlessness is doing here, by the way (he never says that Chi doesn't exist).

Personally, I believe in those kind of energy, and have felt them myself (although it could be attibuted to other phenomenas, so my opinion isn't fixed) but seriously doubt that they can have that kind of effects (throwing people away and such "powers").

I've always been skeptical of those claiming supernatural powers, cause it has a history of being used to convince people to join movements. A kind of marketting tactic, in a way.

Those practices we are talking about are, I think, about being in harmony with the flow and with your body's vibration. Not to impose your will on them.