Jack makes them join his group in chapter 11.
sam and eric
The hunters torture Sam and Eric until they agree to join Jack's tribe.
The mask scares both sam and eric.
sam and Eric don't get treated well well by jack and his boys they just go along with them.
no
sam and Eric
Dear Sam, Can I join you and the othersiders From,Jack
no but sam's aunt is black
Samneric
Sam and Eric are mistreated by Jack and the hunters, who bully and threaten them in an attempt to gain control and power over the group. Jack views them as inferior and uses intimidation tactics to assert his dominance.
Ralph learns of Jack's plans for him in Chapter 12 when he overhears Samneric's conversation about Jack's intention to hunt him like a pig. This revelation prompts Ralph to flee for his life through the jungle while being hunted by Jack and his tribe.
The two boys who left Ralph's group to join Jack's group in "Lord of the Flies" are Sam and Eric, also known as Samneric. They were lured by the promise of hunting and adventure in Jack's group, which appealed to their primal instincts and need for excitement.