What if all lighting are discharge phenomena, where torus photons are ejected and gained light speed but collapsed later in their path and are projected into the past, somewhere/anywhere before the source?
The gray beam is due to photons returning from the future. And when the experiment setup is rotated,
the gray beam remains parallel to the direction of Earth's motion.
This beam generates a virtual image of the source. On the opposite side of the source we see two images, one refracted and another from the future.