What specific incident caused the author to have second thoughts about his trip to Shirdi?

The author's journey to Shirdi was almost derailed by a tragic event that deeply affected him. As recounted in Chapter 2, a very close friend of his experienced a terrible loss in Lonavala. His friend's only son, who was healthy and virtuous, was suddenly struck by a fever and died. This happened despite all human remedies being tried and even after the boy's grandfather, a Guru, was brought to sit near him. Witnessing this profound crisis where a Guru's presence seemed to be in vain caused the author's mind to suddenly change, filling him with doubt on the very day of his planned departure for Shirdi.