Keith wrote:
"I do not find that step 7) is in error."

Step 7) declares power is zero at quarter wave points where volts or
amps are zero in the standing wave pattern.

Power flow does not stop at an actual short or open in a line. It merely
changes direction. At zero volt or amp points, where there is no actual
short or open, no reversal of direction occurs. Power flow is affected
in no way by standing wave nulls or maxima where no impedance
discontinuity exists.

Energy exists in every SWR null. It is in the two waves which produce
the null as these experience no change in energy due to standing waves.

Best regards, Richard Harrison, KB5WZI