Dr Chanda was puzzled because he had never dealt with a case such as Bepin Babu’s. It was outside his field of experience.
The unusual thing about Bepin Babu’s case was that he remembered everything in his past except for one particular incident. Dr Chanda said that Bepin Babu must have been to Ranchi. However, due to some unknown reason, the entire episode had slipped out of his mind.