U.S. Biathlon Nationals might not actually feature all the best biathletes in the country, but so far it has proved one thing: the team selected to compete in Europe is really, really fast. Saturday didn’t seem auspicious for anyone, with rain blanketing the West Yellowstone course and every biathlete winding up soggy. But for the second time in as many races, the two World Championship team members who decided to compete at U.S. Nationals took...