A Nevada County judge refused to reduce bail this morning for robbery suspects Ashour Amirkhas and Cameron Sheppard, allegedly involved in a drug deal gone awry in Grass Valley last Friday night."An officer found Mr. Sheppard in the act of holding the victim, who's hands were duct-taped, on the floor, face down," Nevada County Superior Court Julie McManus said. "He was holding a shotgun to the victim's head and was in possession of his wallet, jewelry and cell phone. I'm not going to disturb bail at this time."A handcuffed Sheppard, 22, sitting in court next to Amirkhas, shook his head …