Mamchand was unable to respond to the queries as to why the armed policemen who were present at the spot refrained from using force when the mob killed Singh. Singh was killed outside his house at Paschim Vihar by a mob in the riot that had followed the assassination of then Prime Minister Indira Gandhi.

During the investigation, Mamchand had examined inspector Rana, who was present at the crime scene but allegedly did nothing to save the victim or his family. After Mamchand testified that he was asked to handle the present case and he recorded statements of a few victims and witnesses in the case, the prosecutor asked him as to what was the explanation given by Rana regarding his alleged inaction.