I wouldn't say that Real Madrid will win if they score two goals in quick succession. Barcelona is not a weak team. They have the ability to make a comeback. Despite conceding two goals, Barcelona continued their attack.
Come back? Just like that? 
This is Real Madrid in an El Clásico and a final, lol. Not some game against Osasuna in a regular la liga weekend where Barça just make a comeback out of nowhere.The more Xavi Hernandez remains at Barcelona the more the team would be in big troubles, I am not seeing any good tactics from this team and today's match against real Madrid just proves it, Barcelona defense a playing a high line when they can't actually keep an offside, it's three goals to one now with Vinicius Jr getting a hat trick in the first half. I think this game would get worse for Barcelona because I don't see how they want to recover from this.
Absolutely horrible defensive display by Barcelona. In fact, they are even lucky it's just 3 goals. I don't see why the high line of defense was necessary early in the game.