the thing about coin manipulation was that it took all shadow 's head to do it ; or rather , he could not do it if he was angry or upset , so the action of practicing an illusion , even one with , on its own , no possible use-for he had expended an enormous amount of effort and skill to make it appear that he had moved a quarter from one hand to the other , something that it takes no skill whatever to do for real-calmed him , cleared his mind of turmoil and fear .