Describe the specific interaction at the mosque that so deeply affected Kaka Mahajani's friend.

The interaction at the mosque was the pivotal moment for Kaka Mahajani's skeptical friend. According to Chapter 35, as soon as the friend set foot on the step of the mosque, Sai Baba saw him from a distance and called out to him in sweet words. What astounded the friend was the specific tone and manner of Baba's speech. He recognized it immediately, stating, "This is exactly my father's way of speaking; this voice is certainly familiar." It felt like a perfect imitation of his deceased father's vocal style. Hearing these words as if from his father's own mouth caused the friend to melt inside, forget his prior skepticism and resolutions, and bow his head at Baba's feet in amazement.