Wavering Dortmund remains a mystery to itself

by Oliver Trust

BERLIN, Oct. 6 (Xinhua) -- The frustration on Borussia Dortmund coach Nuri Sahin's face told the story, as his expression seemed frozen in disappointment. While the 2011-12 German champions have delivered nearly flawless performances in the UEFA Champions League, securing two commanding victories over Club Brugge (3-0) and Celtic (7-1), troubles in the Bundesliga have sparked growing concern.