Where does Ralph hide, and how did Jack and his savages force Ralph out of his hiding spot?

In the last chapter of the novel, Ralph tells Samneric that he plans on hiding in a thicket next to Castle Rock. Ralph hopes that by hiding close to Castle Rock, the savages will never think to look for him and pass by him while they begin their search. While Ralph is eating the piece of meat that Samneric gave to him, he thinks about how he will crawl deep into the thicket and cover himself with creepers so that he will not be seen. The next morning, Ralph buries himself into the thicket and hears the savages searching for him. Unfortunately, Samneric give away Ralph's position and the savages roll a massive boulder in his direction. After the boulder narrowly misses Ralph, he begins to smell smoke. The savages decided to set the thicket on fire and smoke Ralph out. Ralph is forced to leave the thicket and the chase begins as Ralph runs into the forest.