What is the main story told in Chapter 5 about a Guru and his disciple, and what was the lesson?

The primary story in Chapter 5 is about a Guru who was deluded into thinking he was Sai's master and that Sai was his disciple. He fled from Sai but returned many years later, his delusion dispelled, and repented. As Chapter 5 explains, Baba treated him with the same respect as before, and the man became pure. The core lesson from this "profound play" is the paramount importance of discipleship. The text states, "Whether one should become someone's or make someone one's own, there is nothing better than this; otherwise, one cannot cross to the other shore." This highlights the value Sai himself practiced in maintaining the feeling, "His Guruship to him, and my discipleship to me."