By Alex Prewitt After fighting on the front lines of the COVID-19 pandemic, American Nina Roth and Brit Vicky Wright are battling in women’s curling in the Olympics. BEIJING — Two heroes took the ice on Sheet C at the National Aquatics Centre here Saturday night, wearing jerseys instead of their usual scrubs, carrying brooms instead of stethoscopes. For the next two-plus hours they pushed, swept, called, competed alongside their curling teammates—thousands of miles away from their other respective teams cheering them on. It is a known reality of these Winter Olympics that many athletes maintai…