For Canada’s Devon Kershaw, the biggest moment in Saturday’s classic pursuit in Oberhof, Germany, came not on the homestretch, but with four kilometers left in the 15-kilometer race—the second stage of the 2011 Tour de Ski. After working his way up through the field, Kershaw found himself at the front of the race, with Switzerland’s Dario Cologna and a few other skiers on the attack. But rather than charging ahead, the 28-year-old Kershaw did something...