Answer :
In the passage, the oxymoronic statement "dark light" plays the role of setting an ominous, unsettling mood. This phrase creates a sense of contradiction and ambiguity, which adds tension and mystery to the scene.
1. It helps set an ominous, unsettling mood.
The term "dark light" is paradoxical as darkness is typically associated with the absence of light. By combining these conflicting elements, the author conveys a sense of unease and foreboding, contributing to the suspenseful atmosphere in the passage. John's reaction to seeing the "dark light" as he shudders with a tingle down his spine indicates that this description intensifies the feeling of apprehension and fear.
Overall, the use of the oxymoron "dark light" effectively enhances the mood of the passage by creating a sense of darkness mingled with an eerie glow, thereby heightening the reader's sense of anticipation and setting the stage for potential danger or suspense.