What is the main story about a Guru and disciple in Chapter 5?

Chapter 5 narrates the story of Devidas and a Fakir. Devidas, who was considered a Guru by many in Shirdi including Tatyaba, had a scriptural debate with the Fakir. As described in Chapter 5, Devidas defeated the Fakir with his detachment, causing the Fakir to flee to Vaijapur. This Fakir, who later returned and bowed to Sainath, had his delusion of being a Guru to Sai dispelled. Sai Baba, however, maintained the feeling that "he is the Guru and I am the disciple," treating the Fakir with respect and teaching a profound lesson in humility. This entire account was originally made known by Mahalsapati.