Answer:
The setting is some sort of therapy session perhaps one where "survivors" tell their stories. The seventh man of the title tells his story within this minimal framing. He recounts a childood experience, the loss of his best friend K, and his own survival, during a typhoon and tsunami when he was 10 years old.
Answer:
When he talks about duties, he talks about how he is willing to help Macbeth due to his respect to him, however, Banquo also knows that Macbeth may have done something terrible in order to become king so he also could be saying that it is his duty to stop Macbeth from committing any more crimes.
I don’t quite understand to in my own words: to help us know what we don’t know
You didn't provide us with the text.
Twain accomplishes his purpose chiefly through telling a story within a story, also called a "frame story".
