Ram Gopal Varma, who first became enamoured of the emotive brilliance of Amitabh Bachchan???s performance in ???Khuddar???, believes casting the megastar in ???Nishabd??? and ???Aag??? was a mistake. ?????? If somebody argues that Amitji had no business doing those films without knowing what he was getting into, yes, he was guilty of misplacing his trust in me, but he was not guilty of not doing his best,??? Varma writes in his book ???Guns & Thighs???, saying Bachchan completely succumbs to a director???s vision or lack of it once he commits for a movie.