Jack controls the others in an effort to gain power over all the boys. He tells them what to do and gives them the impression that without him they will starve and die. He turns them more and more savage until they are willing to kill to stay in his good graces.
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Jack has a haughty air about him, as if he's better than the other boys. He likes to be leader, so when Ralph gains said position, he doesn't take it too well. Technically, in Jack's eyes, he IS better than the other boys (ex. he's head of the choir, the choir boys always listen to him).
the mask sets jack free from civalization. This will turn jack into a savage.
Ralph is angry
To quote directly from the book... "That was Jack and Maurice and Robert," said Ralph. "Aren't they having fun?"
Jack tells his tribe that they will hunt, and give a feast and invite the others who have not joined his tribe, to come eat and join them