How did Sai Baba's voice and words specifically impact the friend of Kaka Mahajani who was initially a skeptic?

Chapter 35 explains that the impact of Sai Baba's voice on Kaka Mahajani's skeptical friend was profound and transformative. When Baba called out, 'Why have you come in this manner?', it was not just the words but the 'charming tone' that astonished the man. He recognized it as a 'perfect imitation of his father's exact vocal style,' a voice he believed was familiar. The text notes the 'magic power' in that speech, which caused the friend to melt inside and forget his intellectual resolve against bowing. This deeply personal and miraculous auditory experience completely shattered his skepticism.