"It was the Barcelona forward's first miss in a penalty shootout during his legendary career."
I would compare this to Lebron James missing an uncontested dunk to win a tie game in the final seconds.
And it was a penalty kick, he had plenty of time to make a decision. He just missed at the worst possible time.
It's funny when you miss in this situation, it is considered a choke. But if he missed this exact same penalty kick in a game of no importance, it would just be a miss. It's all perspective.