What was the specific event that caused the man who was averse to idol worship to bow before Sai Baba?

The pivotal event that caused the devotee of the formless to abandon his resolve was an auditory miracle. According to Chapter 35, this man had come to Shirdi with Kaka Mahajani purely out of curiosity, vowing not to bow. As he entered the mosque, Sai Baba saw him from a distance and spoke. The magic was in the sound of Baba's voice; the text states it was a "perfect imitation of his father's exact vocal style." Hearing speech as if from his own deceased father's mouth caused the friend to be "amazed in his mind" and "melted inside." This deeply personal and emotional connection completely dismantled his preconceived notions, leading him to spontaneously bow at Baba's feet, forgetting the promise he had made to himself.