At half-time in Saturday's Clasico, Barcelona had out-passed Real Madrid by 390 to 172 and enjoyed 69 per cent of the possession. A fat lot of good it did them.
Madrid were 2-0 up having had more shots on goal, with eight to Barca's six and more on target (3-1). Federico Valverde had also hit the post as things threatened to get truly ugly for the Blaugrana.
Ronald Koeman has seen a remarkable turnaround since the new year, with Barca transformed from also-rans to many people's title favourites heading into this 2-1 defeat to their bitter rivals.
But against elite opponents, as in painful reverses earlier this season at the hands of Madrid, Atletico, Juventus and Paris Saint-Germain, they again came up short. For that, their coach must take his share of the blame.
During a prior run of 13 wins and one draw in LaLiga in 2021, Koeman frequently deployed a 3-4-2-1 formation and the result was some swashbuckling performances, most notably a 6-1 routing of Real Sociedad before last month's international break.
This week's last-gasp 1-0 victory against Real Valladolid was far more laboured and Koeman blinked. Antoine Griezmann, having formed a free-flowing forward trident with Lionel Messi and Ousmane Dembele, was consigned to the bench at Estadio Alfredo Di Stefano.
Dembele was the match-winning hero against Valladolid but here cut an isolated figure as a lone striker, with Messi dropping deeper and deeper into midfield, trying to make something – anything – happen.
For all their numbers in the middle, Barcelona could not turn their possession into clear chances, nor could their apparent control prevent them from being eviscerated time and again on the break.
Karim Benzema's backheel finish for the opener was of the highest class, but Barca looked clueless as the white shirts rushed towards them.
Perhaps mindful of his poor record in big games this season, Koeman abandoned his successful formula for an approach that left Barca painfully between two stools.
Messi audaciously shot directly from a corner just before half-time, outfoxing Thibaut Courtois with vicious dip to hit the post. It was the latest of countless demonstrations of his genius in this fixture, but it was also a shocking indictment of Barca's overall play that it felt like a legitimate ploy.
The enduring and repeated image of the first period was Oscar Mingueza sprinting back towards his own goal wearing an anguished look as the effervescent Vinicius Junior showed him a clean pair of heels. Madrid's Brazilian forward enjoyed a career-best outing against Liverpool this week and was in no mood for the fun to stop.
Mingueza tired of that torment and took himself off to the Madrid box in the 60th minute to shin one in after Griezmann – on at half-time – dummied a cross from Jordi Alba, the full-back who was all at sea on the first goal before failing to head Toni Kroos' deflected free-kick off the line
Having made defenders look silly earlier on, it was Vinicius' turn to revert to slapstick as he broke clear with a chance to seal the points, only to botch a pass to Benzema where the idea was bad and the execution was worse.
To add to a mounting sense of chaos in torrential rain, Zinedine Zidane started taking off all his best players with an eye on Anfield.
The concluding moments were an encapsulation of this undulating LaLiga title race – hard to predict, full of errors and utterly captivating. Martin Braithwaite had a soft penalty appeal rejected amid great fury, Casemiro clumped into Mingueza and his perpetual mayhem to earn a second yellow card.
Top since November, Atletico Madrid will go back above their neighbours at the summit if they beat Eibar on Sunday. All three heavyweights will still fancy their chances, including Barca on account of their form leading into this weekend.
That is why this felt like such a missed opportunity for Koeman. His team have been the best in the country since January but he decided not to be bold when the stakes were highest.
For all the bridges built with a distant fanbase, turbulent boardroom and a star player whose future remains in the balance, this was a damaging backwards step.
And what of Messi? As things stand, his last act in this eternal rivalry will be delivering a free-kick for Illaix Moriba to hit the crossbar before a roving Marc-Andre ter Stegen hacked away at the rebound and booted the ball up Trincao's backside.
Perhaps he'll hang around after all.