If, at any stage of the proceeding, the Lokpal—

   (a)  considers it necessary to inquire into the conduct of any person other than the accused; or

   (b)  is of opinion that the reputation of any person other than an accused is likely to be prejudicially affected by the preliminary inquiry,

the Lokpal shall give to that person a reasonable opportunity of being heard in the preliminary inquiry and to produce evidence in his defence, consistent with the principles of natural justice.