Re: Ki-Aikido or Taiji - effectiveness in developing Qi?
I don't understand what there is to "get" about that quote of yours.
It's a pretty basic, albeit it dramatic example of using (I'll use some fancy "internal" words for you) horizontal jing. I could go you one better then that and describe connecting to the ground to make upward force, or downward force; vertical jing.
The ground doesn't "make power", the ground only provides a stable platform to issue force from. There is a word for using it in ground applications its called "turning over".
Now if Dan would answer hafts question, all would be answered.