What is the story that gets introduced at the end of Chapter 12, and why is it being told?

Towards the end of Chapter 12, the narrative introduces an upcoming story about a man named Mule, who was a ritualistic and orthodox Agnihotri (a keeper of the sacred fire) from the holy city of Nashik. The text explains that Mule came to Shirdi due to the strength of his past merits, as no one can even stay in Shirdi for a moment without such a karmic account. The chapter explicitly states that this is a "very delightful story" that is being told to illustrate the greatness of the Guru. Its purpose is to serve as an example that is "indicative of love for the Guru's devotees," setting the stage for a lesson on faith and the Guru's power.