discussed Cited as authority (rule) People v. Isby The court noted that it is central to the principles established in Powell v. Alabama, supra, and subsequent eases, 11 that in addition to counsel’s presence at trial, the accused is guaranteed that he need not stand alone against the State at any stage of the prosecution, formal or informal, in court or out, where counsel’s absence might derogate from the accused’s right to a fair trial.” Id. at p. 226 [ 18 L.Ed.2d at p. 1157 , 81 S.Ct. at p. 1932], This principle reflects the realization that today’s law enforcement machinery involves critical confrontations between the accused and…