"He had even glimpsed one of the stripped, brown, black, and red boys and judged that it was Bill." "This was a savage whose image refused to blend with that ancient picture of a boy in shorts and a shirt."
"He walked slowly into the middle of the clearing and looked steadily at the skull that gleamed as white as ever, the conchead done and seemed to jeer at him cynically."
"We thought it was." "-We didn't know what it was."
"We thought-" "Memory of their new and shameful loyalty came to mind."
"It's only me Ralph."
Ralph is shown hiding in the forest. He hides from Jack who is trying to take over their civilization, and is willing to destroy Ralph to prevail. He sees one of the boys,and does not recognize him at all. The narrator is trying to show the reader that pure evil lies within us all, and all that has to be done is brought out of us.
Ralph is encountered face to face with the skull of the pig. I think this moment captures perfectly the truth revealing to Ralph. Goulding was trying to depict the true power lies within men, and we try to use other things to escape this reality.
Sam and Eric symbolize the loss of innocence in men. They were ready to attack Ralph no matter the circumstances. They have become savages, and forgot who they really are. It shows how far we will go, and how quick we will let the evil overtake us.