Q3. How was McMurdo’s strength and resilience tested by the gang and what task did he take upon himself to prove his worth

During this “story within a story," we learn that Douglas once bore the name “Jack McMurdo," and that he was part of a notorious gang in the United States, which was not unlike the Mafia. At the end of Part II, however, we learn that “McMurdo” is really a Pinkerton detective named “Birdy Edwards." Throughout all three of his “identities," Douglas is described as fearless, intelligent, and good-humored. He tests the gang both physically and intellectually.