Now we have gone from - 1. It doesn't happen - to 2. It does happen, but it doesn't matter - to 3. It is a waste of time, a last resort diversionary argument designed to avoid answering the question. Incidentally, the load does not "tug" on the source. The load furnishes speed-of-light feedback information to the source through reflected EM energy. The feedback from the load is what causes changes in the source. There is no other speed-of-light phenomena known to physics that could cause changes in the source other than reflected energy feedback. The load is obviously communicating with the source using speed-of-light signals. Electrons cannot travel at the speed of light. Only photonic traveling wave/field energy could be accomplishing that communications feat and the only energy that exists are in the forward and reflected waves/fields bouncing between the load and the source causing the transient conditions that you describe in the tank circuit. Thanks for the additional example of forward and reflected EM traveling wave/field energy inside the source. EM energy cannot stand still in an RF circuit. It is either moving forward or moving in the reverse direction. Your description of the transient state delay before the source settles down is even more proof that forward and reflected energy is rampant inside the source. What phenomena causes the communications from the load to the source that causes all those "tug on the tank" transient delays? There is none of Einstein's "spooky action at a distance" in your example. All communications between the load and the source is EM forward/reflected fields/waves. That is true when there is any speed-of-light delay present. Point is that there is no other known communications method besides forward and reflected energy that could be at work in an RF circuit. Note that I am not proposing any quantitative answers. I am presenting qualitative conceptual answers based on the laws of physics. If the photonic EM energy bouncing around inside a source at speed-of-light delays is not forward and reflected energy, exactly what is it? Please be specific. Hint: All of the transient signals moving at the speed-of-light in the circuit that you describe prove the presence of EM waves/fields by proving the presence of photons, i.e. the presence of forward and reflected waves/fields rampant inside the source circuitry. If there were no reflected wave/field energy feedback from the load all the way to the source, the source conditions would never change away from the matched condition. So it isn't a waste of time because it proves all EM transient phenomena is caused by forward and reflected field/wave energy inside the source. It disproves the contention that reflected energy stops at the source output connector. There is no impedance discontinuity at the source output connector to cause 100% re-reflection of the reflected waves to occur.