By Stephanie Apstein The 22-year-old who trains alongside grade-schoolers at a tiny shopping mall rink is the country’s first-ever skater to advance to the free skate final. View the original article to see embedded media. BEIJING — Wearing a grin the size of the rink, Donovan Carrillo wiped away tears and sweat and lamented the only disappointment of his Olympics so far: He had to get off the ice. “I didn’t want it to end,” he said afterward, still beaming from his personal-record 79.69-point performance, a personal best. “I wanted to keep living the Olympic dream.” Even figure skaters who tr…