It was a tense game indeed.... Barcelona had the ball at their feet the whole time and were much more offensive than their opponent but he had a hard time getting past Napoli's defense.
The Spaniard was the one who tied the game from a penalty kick, it's true, but he could have left the Camp Nou as a great hero if they hadn't lost three goals. In the first throw, he was unbalanced, ok! but in the other two opportunities, he was facing the goal, in a good position and, even so, he sent it out .... it was ridiculous !!!
I don't know, which is to be expected. It was obvious to me before the match that the teams were about equal and it was likely to be either a minimum win for one side or a draw. The result on the scoreboard is a draw... And the kind of mistakes you write about few people forgive, I think he had a serious talk with the coach, because maybe thanks to his moments he could have ended the match peacefully, not worrying about the return game