"'I painted my face--I stole up. Now you eat--all of you--and I--'" Chapter 4, Jack vs. his gang, showing his leadership
"There aren't any beasts to be afraid of on this island....Serve you right if something did get you, you useless lot of cry-babies!" Chapter 5, Ralph vs. the group, showing his leadership and his rationality
"'We musn't let anything happen to Piggy, must we?'" (Jack speaking) Chapter 7, Ralph vs. Jack, struggling with their friendship and each trying to assert power.
"He says things like Piggy. He isn't a proper chief.'"
Chapter 8, Ralph vs. Jack (Jack speaking), struggling with power
"'This is 'jus talk... I want my glasses.'" Chapter 11, Piggy vs. Ralph, compelling him into action against Jack
Here is a selection:
Ch. 4: He began to dance and his laughter became a bloodthirsty snarling.
Ch. 5: "(F)ear can't hurt you any more than a dream. There aren't any beasts to be afraid of on this island....Serve you right if something did get you, you useless lot of cry-babies!"
Ch 7: "'Kill the pig! Cut his throat! Kill the pig! Bash him in!'"
Ralph...was fighting to get near....The desire to squeeze and hurt was over-mastering.
Ch 8: "You're not wanted...So don't try it... See? Jack and Roger and Maurice and Robert and Bill and Piggy and Ralph."
Ch 11: "The rock struck Piggy a glancing blow from chin to knee; the conch exploded into a thousand white fragments and ceased to exist."
Ch 12: Ralph launched himself like a cat; stabbed, snarling, with the spear, and the savage doubled up.