By Alex Prewitt While she can’t be on the ice after suffering a gruesome injury in the first game in Beijing, the 30-year-old star center is still making an impact from the sidelines, as a coach with a unique perspective. BEIJING — When Brianna Decker went down during the first period of the U.S. women’s hockey team’s first game at the 2022 Winter Olympics, suffering a broken left fibula and several torn ankle ligaments in a gruesome fall against Finland, the defending gold medalists lost their alternate captain and star center for the rest of the tournament. But they also gained a coach. “We …