According to parts of his books, he wants to show how brutal slaves were treated but he never had the intention to play the victme on his books, all the terrible moments he mentions on his books made him go on and on because they, uncounsciously, fed his desire for freedom and helping other slaves.
Read the story and figure out whats missing. Without the whole story, no one can tell you what important part is missing. Find the section that that excerpt is from and see what the differences are, or post the full story.