Atletico Madrid coach Abel Resino had no answers after their 5-1 humiliation by Racing Santander.
Resino said: "There were a lot of mistakes and the team was never in the game. These are things that are incomprehensible and inexplicable, I cannot understand it and it cannot be explained.
"Neither I understand it, nor the fans or the players will understand."
He added: "I am not about to walk away. Tonight I feel bad. But tomorrow I must return to work and lift the players. I will keep going, I am a fighter."