When Germany’s Andreas Birnbacher left the shooting range for one more three-kilometer loop in Sunday’s mass start race, there was little doubt that he’d be beaten to the finish line. Yes, Birnbacher was leading. And yes, he was wearing the red bib denoting that he led the discipline standings on the World Cup circuit. There was just one problem: Emil Hegle Svendsen of Norway was right on his shoulder. Just one day earlier, Svendsen had...