The light emitted by the crab beam circled the Earth and hit the crab beam itself.
Since we're calling it an "Earth-circling" light beam, while there are minor differences depending on location,
basically we're talking about a gravitational lensing effect occurring under 1G gravity
（the light doesn't travel in a straight line but follows a certain height above the ground）.

Also, from the fact that it's saying "Hot!"
we can tell it's carrying a decent amount of thermal energy.
But if it's still hot after circling the Earth and losing energy, what was the initial output then? And then there's the fact that
there's zero obstruction during the entire journey around Earth, which is basically impossible,
there are too many things to nitpick about, but we mustn't dwell on them.