RUHPOLDING, Germany – There were plenty of errors at the IBU World Championships mixed relay today, mistakes that were big enough to have a surprising and significant impact on the outcome of the race. France’s third-leg racer, Simon Fourcade, received the tag from Marie Dorin Habert in second place, just 11 seconds behind Norway. But he imploded in spectacular fashion, using all six of his spare rounds, hitting the penalty loop, and losing almost two...