The Warriors worst nightmare wasn't the score, even though they were blown out of the Toyota Center in this first half, trailing by as much as 23 points. Stephen Curry, the Warriors superstar and the man who has enthralled the sports world for most of the last season, went up to block a shot by Trevor Ariza on the defensive end, but he went over Ariza's back, flipped head over heels and landed hard on the floor, under the Rockets basket. The medical staff gathered, along with Coach Steve Kerr. The raucous crowd in the Toyota Center remained hushed. With assistance he was helped off the court to the Warriors locker room. [...] the official word cmae just a bit before halftime: