This was less expected from Barcelona, even if they have to lose but not like this for a club who has started very amicably and kept straight win for the past 5 matches, early goals in the first half is really a bad sign that now they should step up their game to at most finish in draw rather than loss whole three points.
Losing this fixture means lessening the margin of goal difference between them and Madrid which makes it a bit more possible for Madrid to take on the lead. Barcelona started the season pretty well, i only have to believe that there is a way out of these, we may likely end up seeing a draw in today's game if they probably would do same as what we saw in Dortmund, with a wonderful comeback in the second half.
A total defeat by 4-2... It was really a disaster for Barcelona after such an incredible start.

Hansi Flick took full responsibility of this loss on his comments related to the game. People criticized Yamal's being in the substitutes. But I understand the manager on this. Because he has to rotate players as the schedule is very busy. It is the same situation for any team competing in European tournaments at the same time.
When it comes to the Madrid derby, it is time. It is tonight.

Barcelona would make use of a draw in this game. I think it is a quite probable result. Simeone's students also started pretty well as you have seen so far.