How does Chapter 33 explain the connection between the Dhuni, the Udi, and a devotee's departure from Shirdi?

Chapter 33 of the Sai Satcharitra details the integral connection between the sacred fire (Dhuni), the ash (Udi), and a devotee's journey home. Baba would pile up heaps of logs and offer them into the Dhuni to create a great quantity of ash. This Udi was then given to devotees. A specific practice mentioned in this chapter was related to departure. When devotees asked for permission to leave Shirdi and return to their villages, Baba would give them Udi. The text explicitly states that when Baba said, 'Take the Udi,' true permission was granted, which would make the departing devotee feel enthusiastic and blessed for their journey.