Barcelona played well in the first half but they couldn't maintain the good performance in the second half. There is something wrong with their tactic in the second half, so the players can't play effectively. Well, I'm not sure Barcelona will win the match although Lewandowski and Raphinha can play since the first half. They just recovered from the injury, it is too risky to put them in they starting lineup. Xavi has done the right way by releasing them in the second half. If you watched the match, Lewandowski played since minute 61' but he can't help anything.
Yes, Bellingham performed very amazing. He becomes the player who can make a difference in the match. Barcelona has no player like Bellingham in their squad.
There was nothing wrong with Barcelona, Real Madrid outgrew them in the second half, that was what happened and they didn't retaliate quickly. Barcelona was smart to net goal in the 6 minutes of the first half but that was not by main performance, they were fast to take chance in Real Madrid but after that, Real Madrid kill all the compression that was coming to them and when Anceloti saw that Barcelona couldn't go further, he brought in Modric and Joselu to change style of Real Madrid, that was how Bellingham had it's opportunity to lead the team by 2 goals to 1.
It's amazing to see how Bellingham is playing the role of striker and midfielder very well, I'm not sure of the particular position that guy is good at but he is nothing but mission fashion against the teams in Laliga, he is doing more than what is expected of him. Only Girona is closed to Real Madrid now but I believe in the next few matches, Girona will be some point below Real Madrid.
Barcelona on the other hand are getting weak, last Girona finished at number 10th in the standing, lost 3 times of matches that Barcelona lose but I'm astonished to see how they have point than Barcelona and even have similar number of loss this season with Real Madrid and Barcelona, what is that ingredients they have that we are not seeing.
In fact, the performance of Barcelona was not bad at all and I think they could even finish the game with the 1-0 result they got at the start of this match but the fact about Real Madrid is they have some players in their team like Jude Bellingham who can change the game for his team and this is the only reason to see Barcelona losing the El Classico match against Real Madrid.