Ichabod experiences fear and apprehension in the grove. This line exemplifies the psychological distress that Ichabod experiences in the presence of the grove: "Once more he cudgeled the sides of the inflexible Gunpowder, and, shutting his eyes, broke forth with involuntary fervor into a psalm tune.” Also, the narration describes how Ichabod speaks with “stammering accents,” which shows his terror.
Answer: A detail that exemplifies Ichabod's psychological distress is when he is described as speaking with "stammering accents." Taking this into account, it shows Ichabod's fear and inability to speak clearly.
