Erica Vanstone and her league, the Women’s Flat Track Derby Association, want to play roller derby, but the safety of the players is the priority for the WFTDA executive director. It’s a complicated task. Unlike the pro leagues that are planning their returns, she doesn’t have the CDC or White House on speed dial. But that doesn’t mean Vanstone and her league take this any less seriously. WFTDA has 40,000 players, coaches and officials in 450 leagues and 23 countries. The coronavirus has ravaged some, while others have been largely unaffected.