I know some masters are reluctant to demonstrate power, claiming (whether true or not) that they are afraid of hurting the student. I wonder if this is true or they just want to hide the fact that they can’t do it well.

You can’t teach how to use a technique without showing how the power is applied or at the very least what it feels like to be tapped, even if lightly. This method of teaching is known as “feeding power” in traditional circles.

To me the concept of “feeding power” is just hands-on teaching. Nothing mysterious about it.