Barcelona pulled themselves out of the abyss and, with a major turnaround in the duel with Celta, took perhaps a key step towards the Spanish championship title.
Barça were leading, then losing 3:1 at Montjuic midway through the second half, and Rafinha's penalty in the eighth minute of stoppage time brought them the big three points - 4:3.
Dani Olmo was Hansi Flick's wildcard - he came on in the second half, reduced the deficit to 3:2, and then forced a penalty that the Brazilian converted into a golden triumph.
The career of Borja Iglesias was thus "undone", as he scored a hat-trick and responded to the "blaugrana"'s early lead when Ferran Torres scored.
Celta had everything, even a goal in the final minutes with the score tied at 3:3, but then defender Joel Lago inadvertently fouled Olmo and "pushed" the leaders to victory - Rafinha scored from the penalty spot to make it 4:3 after also scoring the equalizer.
Hansi Flick had reason to celebrate after the game, running almost to the center of the field to congratulate his players, but the satisfaction was not complete because Robert Lewandowski was injured.
The Pole left the game midway through the second half due to muscle pain and does not appear to be ready for the match against Mallorca on Wednesday, and it is already clear that he is a big question mark for the "el clasico" in the King's Cup final, which is scheduled for next Saturday.
With a match more than Real (who host Athletic Bilbao on Sunday), Barça also has seven points more.
And Atletico Madrid are 10 points behind the leaders after an unexpected defeat in the Canary Islands.
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