Bob Bowman, known for coaching Michael Phelps, was moved to tears watching his pupil Leon Marchand win the 400m individual medley in front of a passionate French crowd. Marchand's dominant victory set an Olympic record, narrowly missing the world mark. Bowman praised Marchand's poise and focus under pressure, impressed by the young swimmer's humility and work ethic. Marchand's success reflects their strong coach-athlete bond and dedication to training.