Can you summarize the story about the Agnihotri from Nashik that is introduced in Chapter 12?

Chapter 12 begins to narrate a delightful story that illustrates the greatness of the Guru. It introduces a man named Mule, a ritualistic and orthodox Agnihotri (keeper of the sacred fire) from the holy city of Nashik. The chapter explains that due to the strength of his past merits, he happened to come to Shirdi. It is noted that his original intention for the journey was different, but a fortunate coincidence led him to have a rare meeting with Sai. This event is presented as a testament to how destiny and the Guru's grace guide a devotee, as it resulted in him gaining the benefit of Shirdi and seeing his own Guru.