How did Sai Baba's voice specifically cause the skeptical friend to abandon his vow not to bow?

The magical effect of Sai Baba's voice was the pivotal element in the friend's change of heart. As recounted in chapter 35, when the friend set foot in the mosque, Baba called out to him. The power was not in the words themselves, but in the delivery. The text states that the "charming tone of the voice" was a "perfect imitation of his father's exact vocal style." This auditory miracle, hearing his deceased father's voice through Baba, created an immediate and overwhelming personal connection. The friend was amazed, thinking, "This is exactly my father's way of speaking; this voice is certainly familiar." This experience, described in chapter 35, bypassed his intellectual defenses, causing him to melt inside and forget his vow, leading him to bow at Baba's feet.