HOUSTON - Chandler Parsons launched himself into the air, looking to throw down an alley-oop to punctuate a fast break. The pass was right on target, hitting him right in stride on his way toward the hoop. Instead of throwing down an emphatic dunk, however, Parsons lost control of the ball and could only muster a makeshift layup attempt that never came close to falling. Somehow the simplest of plays had gone awry. Such was the entirety of the Rockets’ Friday night horror show in San Antonio.