My first comment was going to be along the lines of "It'll be two falls, two submissions or a knockout to decide the winner."
Real seemed to be playing a 5-5 formation from the start and it led to the goal. Barca were content to soak up the pressure and it deflated Real when they didn't get the second. Real had some good chances, but didn't make the most of them. Barca's second goal was very lucky, but there was nothing lucky about the third.
I was surprised that both teams finished with 11 men - there's usually at least one red card. Not a "Classico" but still a good game.