How is the story of Damu Anna framed within the Sai Satcharitra, and what is its stated purpose?

In Chapter 25, the story of Damu Anna is introduced as a powerful illustration of Sai's love and protective nature towards His devotees. The author presents it as a report to show how once one-pointed faith is established, Sai wards off all misfortunes. The story's purpose is to make the listener's heart joyful and to reveal the Guru-Mother as an 'Ocean of Mercy.' It is described as a short but very pure story that, when heard with attention, can make difficulties vanish. Its inclusion is meant to directly demonstrate Sai's readiness to protect His followers and grant their desires, reinforcing the core message of faith and devotion.