piggys glasses to start the fire
Jacks weapon is so important for Ralph will take the weapon in attempt to use it against Jack.
Ralph and Jack never liked each other. Once they met and Jack wanted to take the power from Ralph there was instant friction between the two. It's was obviously Ralph's job to be chief and Jack just expected to get it instead of Ralph.
Samneric tell Ralph that Jack intends to hunt him and that he has "sharpened a stick at both ends." Later Ralph finds and takes the stick on which Jack had mounted the pig's head, as an offering to the beast. Ralph realises that the stick has a point at each end. The implication is that Jack intended to behead Ralph and mount his head on a sharpened stick, as an offering to the beast.
Ralph takes Simon and Jack along with him on the expedition.
ralph never knew that he was going to get killed
Jack attacked Piggy rather than Ralph because he knew Piggy wouldn't fight back. If he had attacked Ralph there was a good chance that Ralph would have beaten him and Jack couldn't take the risk of losing face in front of his own hunters.
Ralph and Piggy develop personal-friend bonds, Ralph playfully teases Ralph while the other boys condescend him, Ralph is the only boy who defends Piggy however. Piggy stresses that Jack is against civility, which Ralph stands for, Piggy says that Jack holds no regard for Piggy, nor any concern for him.
To quote directly from the book... "That was Jack and Maurice and Robert," said Ralph. "Aren't they having fun?"
their problems lead them to hate each other and jack trying to take the leadership of Ralph
He takes his group to the platform because Piggy wants to get his glasses back from Jack and the other hunters. And Ralph wants to get his authority back.
This quote is said by Jack to Ralph in William Golding's book "Lord of the Flies." Jack's words foreshadow the increasing hostility and violence that will ensue between the two groups led by Ralph and Jack on the island. Roger sharpening a stick at both ends symbolizes the savagery and brutality that will take over as civilization breaks down.
Jack knows that Ralph was elected to be the chief and is both popular and likeable. Although Jack has overthrown him he fears that Ralph will eventually regain control. While Ralph remains alive he will always pose a possible threat to Jack's leadership. The only way that Jack feels that he can be certain of maintaining his own authority is by removing Ralph permanently, by killing him.