My concerns about Dortmund are happened because ya, even though Heidenheim is only a promoted team but in reality Heidenheim is not bad at all . Because after all,Heidenheim also managed to compete well in the middle of the table and also, the first meeting or match of Dortmund v Heidenheim in this season also ended in a 2-2 draw and then,Heidenheim again managed to hold Dortmund to a 0-0 draw . Although Dortmund still needs a win because to maintain its position in the top four but still,playing against Heidenheim still makes Dortmund fail to get 3 points.
Dortmund showed their typical weakness again: Poor continuity. Dortmund is like a miracle bag this season. You don't know what will come out. Sometimes they play great against world teams like PSG and then they stumble in the next game against a promoted team. Heidenheim could have won the game with some more luck.
Heidenheim may have a low-budget team, but they have made a lot out of these difficult circumstances for many years. Dortmund weren't the first top team they've taken points off.
In the end, Dortmund won't be playing at the top this season. For Dortmund, it's all about third place and direct CL qualification.