CARLOS YULO triple-twisted in the air with a flourish and landed excellently on both feet with a smooth flair and unbent poise to clinch the men’s vault gold medal on Sunday in the 50th Artistic Gymnastics World Championships in Kitakyushu, Japan. Some two hours later, Yulo was back at the General Gymnasium and with another display of upper body strength and grace, annexed the parallel bars silver for a two-medal haul that all but offset his foiled title-retention bid in the floor exercise. Again Yulo—only 21 and two inches short of five feet but already an Olympian—was shy as ever. Thus, Gymn…