Initially Atletico played very well, they managed to withstand Barcelona attacks by forming a solid defense, one goal scored at the end of the first half made them more confident in the second half. Barcelona players' quick response after conceding the second goal made it difficult for Atletico to withstand the attack, two goals in just 6 minutes made Atletico players even more down, Barcelona also managed to make a Fantastic Comeback which made Atletico even more under pressure.
Hansi Flick once again showed his quality as a genius coach who does not give up easily even when his team is under pressure.
I don't see anything genius in Flick, it's just Atletico, and they were exhausted by the Champions League.
I was surprised by Simeone's interview after the game - he started praising Barcelona as an ardent fan. It seems he is mentally not well, firstly because of the loss to Real, and secondly because they are most likely already knocked out of the title race.