LOS ANGELES, Nov 9:(Reuters) Filmmaker Alex Gibney was not alone in being duped by Lance Armstrong and his strident denials that he had doped and cheated his way to cycling’s biggest prizes over the years. But Gibney was in a unique position as the Oscar-winning documentary director who had set out to make what he called a “feel-good” film about Armstrong’s comeback in the Tour de France in 2009. Known for tackling tough subjects like torture during war and the fall of energy company Enron, Gibney could take a lighter approach to a common theme for him – winning at all costs. (agencies)