Chapters 39-42 (Pages 256-278) Is Newt right? Was Gally crazy?

Gally may not be crazy. Notice also that chaos has become the reigning force in the Glade. With the rules of the Glade/Maze relationship completely changed, the Gladers now must adapt to heightened dangers. Gally informs them that the Grievers will kill one and only one of them each night. There is a clear psychological game here to drive the Gladers to action, or to divide them and have them turn on one another.