In a tense moment, Kristof and the narrator witness Grady exhibiting unusual behavior, which causes concern. Grady's frantic gestures and sounds lead the narrator to suggest that he might be experiencing a possession, an extreme reaction to the situation.
Kristof's skeptical response questions whether Grady's actions are due to something like epilepsy instead of a supernatural event. This exchange highlights the tension between belief in the supernatural and rational explanations in the narrative.