An hour before his life changed, John Wall stood on stage in the empty Madison Square Garden theater and rehearsed the impending moment. He and the other projected NBA first-round picks posed for a photo op and received some last instructions. "Big smiles gentlemen," someone said. Wall obliged. He smoothed his palms over the new suit picked out by his mother, hunched his shoulders and straightened his sleeves. Then he checked his wristwatch, big and gleaming as a sundial.