Denver • Buried in the tunnels of the Pepsi Center, The Classical Academy senior Andrew Register sat perfectly still outside the home locker room with tears running down his face. This was it, he said. Moments after his semifinals loss in the 145-pound weight class, Register closed the door not only on his high school wrestling days, but wrestling in general. “I’m done with it. I knew coming into this season I’d be done after the season was over — just too many injuries,” said Register, who’s suffered multiple concussions, a torn shoulder muscle, a broken elbow, a torn MCL and multiple dislocated knee caps as the stalwart in the Titans wrestling program.