How did the interaction between Sai Baba and Nana Chandorkar regarding the Gita verse demonstrate the ideal Guru-disciple dynamic?

The exchange between Sai Baba and Nana Chandorkar detailed in Chapter 39 serves as a perfect illustration of the Guru-disciple relationship. Baba, the Guru, initiates the teaching not with a direct lecture, but by posing a question, compelling the disciple to engage his own intellect. Nana, the disciple, responds with profound humility and respect, joining his hands and speaking with a sweet voice despite his own scholarly expertise. He presents his understanding based on various commentaries, demonstrating his learning, but does so as an offering to his Guru. As Chapter 39 explains, this entire dialogue was orchestrated by Sai so that the true teaching would be impressed upon Nana.