The Cleveland Cavaliers are an ongoing illusion. We'll soon learn if LeBron James is willing to step back from his creation, leave his beloved home town and try to craft something real. At a crucial moment of Thursday night's Game 6 of the Cavaliers-Celtics series, the illusion came alarmingly to life. It was late in the third quarter, the game was slipping away from the Cavs, and the Boston crowd was in an uproar. Delonte West was at the free-throw line. The two men stationed near the basket were Anderson Varejao and Zydrunas Ilgauskas. How monumentally...