What does the flies on the way to Castlerock Ralphs band sets off across the beach which is swept clean like a blade that has been scarred what Tone is set by this detail of setting can you think of a?

The flies symbolize decay and death, while the beach being "swept clean like a blade that has been scarred" suggests a sharp contrast between beauty and destruction. This sets a tone of unease and foreshadows the darker events to come in the story.