Simple clues using tone, dialogue and imagery to find out the specific details.
Samneric ratted Ralph out because Ralph was torturing them.
Samneric
During the confrontation in "Lord of the Flies," Samneric betray Ralph's trust and align themselves with Jack's tribe. They give away Ralph's hiding place to the other boys, leading to Ralph being hunted like prey. Ultimately, Samneric are forced to participate in the hunt for Ralph against their will.
Samneric and Piggy.
Samneric choose to join Ralph and Piggy in Chapter 12 of "Lord of the Flies," after they are captured by Jack's tribe and forced to betray Ralph's hiding place. They express regret for their actions and seek safety with Ralph's group.
Sam and Eric, generally refered to as Samneric in the book are a pair of identical twins. They are bigguns and remain as part of Ralph's group until they are captured when they accompany Ralph and Piggy to Castle Rock to demand the return of Piggy's glasses.
The two boys who left Ralph's group and joined Jack's tribe were Sam and Eric, often referred to as Samneric in the novel "Lord of the Flies" by William Golding. They were previously loyal to Ralph but succumbed to Jack's persuasion and fear tactics.
Ralph is made chief in Chapter 1 of "Lord of the Flies" by William Golding.
Ralph told Samneric that he would hide out in the bushes, so eventually Samneric squeal on Ralph to Jack.
Piggy voted for Ralph to be chief in the novel "Lord of the Flies" by William Golding.
In "Lord of the Flies," Ralph's secret hiding place is revealed to Jack and his tribe by Samneric, Ralph's two loyal friends who are captured and tortured by Jack's tribe. Under pressure and fear, Samneric betray Ralph's hiding place to Jack in order to avoid further harm.
Samneric are twin boys on the island in "Lord of the Flies." They start off loyal to Ralph, but eventually succumb to Jack's influence and join his tribe. Their loyalty to each other is a central theme in the novel.