Even the best, most prepared jockeys like Flavien Prat can be subject to the whims of the thousand-pound animals upon whose back they sit. Prat had engineered a gorgeous trip for the 3-year-old colt Nagirroc easily winning the James Murphy Stakes on May 20 at Pimlico, where Prat settled his mount behind horses and burst to the lead in upper stretch. But in the July 7 Manila Stakes at Belmont, Prat found himself going head and head on a fast pace with Nagirroc, who had little left for the final furlong.