The only level I believe Dortmund are not going to fall is their relegation but anything outside that they don't have a limitation, so actually I think they will fall a little more because of what they have to faced, so the few matches you said is what will justify it. Augsburg which is led by Jess Thorup can make his team to resist Borussia Dortmund since the both has the same to loss, however is a club with higher prestige Augsburg usually knell down, though they have not done it to Leverkusen but Borussia M'gladbach got it two match ago from Augsburg 3:0. However I have Freiburg on mind to also win Borussia Dortmund along the way.
For now, they are far from falling to relegation, and there is a lot to be done when it comes to this situation. One would have believed them to have not been able to do well, but Bayern and Leverkusen have been the ones having the serious struggle, even when people were making more support for Dortmund because before the season started and the case of bayern was that kompany will not be able to handle Bayern, and the last time i checked, they are the ones still topping the table and Augsburg might be able because imagine running with two cripples and that is even why now everything might even end a draw because is not as if Augsburg is even better so to me they are both cripped.