I understand that the depth of Dortmund is just good a d better as compared to that of their opponent a s o winning just didn't get to be a serious issue for them and considering t he margin you will understand that they actually got to win with a very confident form, I'm optimistic about their performance in the champions league having seen their performance in this game which they even didn't get to play with the complete squad, one thing was very obvious in their performance a d that was with their creativity, they seem to be good with how they make chance but then I don't know if it because of the team they are actually playing against that's why they were able to have such performance.
Before now Dortmund usually happens to be the next best team after Bayern Munich in the bundesliga until this season where things seem to be gradually taking a new dimension that it's looking like they are now no longer the second best and so I wouldn't be really surprised seeing such exceptional performance from them and lastly talking about a second leg, I doubt if there will be a second leg against their opponent in the bundesliga, they have only these as they are in the last lap of the league games.