When something boomerangs, it comes back to the person who sent it out - here - the hidden sun is returning light back to the person, whereas, the contradiction states that the hidden sun barely flickered with light, which suggests that there was no light to begin with.
Consider the statement "The hidden sun barely flickered with light.". Based on this "The hidden sun boomerangs with light." a true statement? Yes, no, or I don't know?