How did Sai Baba's voice specifically affect Kaka Mahajani's skeptical friend?

The effect was profound and immediate. As chapter 35 recounts, when Kaka Mahajani's friend, a skeptic, entered the mosque, Sai Baba greeted him with sweet words. The friend was astonished because the tone and vocal style were an exact imitation of his deceased father's. The text describes him being amazed by the 'magic power' in Baba's speech, stating, 'This is exactly my father's way of speaking; this voice is certainly familiar.' This deeply personal and uncanny experience shattered his skepticism, caused him to 'melt inside,' and led him to completely forget his prior resolution not to bow, compelling him to place his head at Baba's feet in surrender.