Real Madrid defender Pepe admits Barcelona knocked them off their stride on Sunday.
Pepe concedes Real allowed the occasion to get the better of them.
"Football is like that and Barcelona got one dead ball opportunity and scored. We played well in the first half and the second goal killed us," he said.
"We took a lot of risks and after the second goal we did not remain faithful to our style of play. That was when Barcelona had more opportunities and we wanted to do things more with our hearts than with our heads."