What does jack claim to feel behind him when he hunts?

In William Golding's "Lord of the Flies," Jack claims to feel a sense of excitement and a primal connection to the hunt. He describes a thrill and exhilaration that comes from the chase, suggesting that he feels a powerful, almost instinctual urge driving him. This feeling contributes to his transformation from a civilized boy into a more savage and ruthless character as the story progresses.