Jem begins to put all of the events that have occurred together, and he begins to understand more. He had kept the secret of finding his pants folded on the fence to himself. But after Nathan Radley cements the knothole of the tree, Jem is able to understand the situation. He realizes that Boo isn't the enemy; the real enemy is Nathan. All of his old childhood fears are replaced by the reality of what happens. He cries the night Nathan cements the knothole because he understands, not because he's still a child. Jem isn't afraid to ask Nathan why he cemented the knothole, and then he takes the time to put all the pieces together. This is a sign of Jem's passage into a young man and loss of innocent childhood.