It is normal to think that way when a particular team has been going on a winning streak. I believe even Barcelona team believed it was a game they would win and take home all three points but met a resilient team that was determined to also get a win from the game. Kudos to Rayo Vallecano for putting up such a strong performance against the current best team in the league and shared points.
I've seen Real Madrid improving and in my opinion Barcelona is starting to worry and suffer psychological stress.
Now I don't know how much Im wrong or if I'm saying something right, but it seems to me that something like this is happening, tell me if I'm wrong.