There is no such thing as "moving infinitely fast", that's something the other person made up. What if light didn't fly straight and made loops and flowed like water and clustered up and stuck together?

If you're going to make up nonsense, you're not talking about physical reality you're talking about cartoons or magic and fantasy.

When something moves fast in photography it has motion blur and that spreads its coverage over a larger area. In this demo the motion blurred 'torus' and 'sphere' both get made artificially more opaque to make the animation work. You can see it happen.

If the ball takes up 45 degrees in the torus then it would be 7/8 transparent when moving infinitely fast. It would be another 1/8 transparent when spinning the torus into a sphere.

"Infinitely fast" being a stand-in for "sufficiently fast" and gated by the speed of light, of course.