Keylor Navas turned the ball over on Real's own box and conceded Espanyol's equalizer, and Fàbio Coentrao had a good laugh about that. The defender was alongside Iker Casillas on the bench and tried to get the captain involved, but Casillas kept his composure and showed respect towards his teammate.
It's true that Navas' mistake didn't cost the team a lot considering that Real still scored three goals after it happened, but Coentrao clearly should have been more careful and respectful. After all, Navas is a teammate who hasn't been given many chances this season. His confidence is probably really low and this gesture by Coentrao will not help.
The footage belongs to El Chiringuito, who proved that Coentrao's reaction happened right after Keylor's mistake. The Portuguese defender is most likely on his way out of the club and he doesn't seem to care much about his teammates anymore. This happens.