Iggy mentions hearing voices, suggesting he is experiencing some kind of auditory hallucinations or inner thoughts. His statement, "Be very afraid," indicates a sense of fear or warning, possibly about what these voices imply or due to a dangerous situation he perceives.
In the context of James Patterson's "The Angel Experiment," Iggy’s comment adds to the suspense and the mysterious atmosphere. It reflects his emotional state and hints at underlying challenges or threats faced by him and possibly the other characters in the story.