OBERHOF, Germany — After several years of playing a dour second fiddle to Petter Northug (NOR), Axel Teichmann (GER) struck a different chord on Friday, besting the Norwegian at his own game with a strong attack on the last climb to win the second stage of the 2012 Tour de Ski. On snowy afternoon at the ski stadium in Oberhof, the race was rife with waxing challenges—temperatures holding at right around freezing, a mixture of...