Did you post this three times in a row? If so I I know this at least the second and I don't think this is going to be answered.
Hello.
By wandering among the proles in London’s poorest districts he can easily report any rebellion.
Have a nice day
The non-fiction technique is used by the action of narrating an actual event that replaces any kind of physical descriptions of his brother’s demeanor. He prefers the actual event to do the storytelling itself, including only a couple of lines commenting it and allowing the reader to witness the narrative reenactment of such event. The fact that the event is presented to the reader exactly as it occurred, along with the affixed interpretation of his brother’s motives provide a narrative mental and somewhat emotional picture of who his brother was as a person by allowing the reader to appreciate his behavior during a particular situation and thus favoring the reader’s identification with the observant, participant narrator that is the author.