In which of the following case, it was held that “The adversary system of trial being what is, there is an unfortunate tendency for a Judge presiding over a trial to assume the role of a referee or an umpire and to allow the trial to develop into a context between the prosecution and the defence with the inevitable distortions flowing from combative and competitive elements entering the trial procedure. If a criminal court is to be an effective instrument in dispensing justice, the presiding judge must cease to be a spectator and a mere recording machine. He must become a participant in the trial by evincing intelligent active interest by putting questions to witnesses in order to ascertain the truth”.