City players need to match Guardiola's level of belief
The Spanish contingent putting the questions to Barcelona manager Luis Enrique at his press conference late on Tuesday night were struggling to comprehend what had happened to the team they referred to as 'we'.
'Was it because Gerard Pique was missing?' 'Were we over-confident after taking a lead?'
Enrique, who has something of the Pep Guardiola about him, described things as he saw them and would not take refuge in excuses.
"If you lose, it's not because of the players who are not there," he said, with mounting exasperation. "I've not got an explanation. This is the game where facts change things. Sometimes there are (two teams operating at) different levels. Sometimes it's not tactical. I could tell you something different but that's not my way…"
It would have been worth Guardiola having some of his players in the packed press room to hear this external assessment of their performance, because where Europe is concerned there is that perennial sense that they and their supporters don't really believe it themselves.
City broke a cycle of inferiority with a signature performance on Tuesday night, steeling themselves against the setback of Lionel Messi's opening goal to end the evening running one of the world's best sides asunder from every point across their retreating back line. It was a demonstration that showed City can think of themselves as a side in the bracket of Barcelona or Real Madrid.
The game did have a 'tactical' component actually, and a very dynamic one, demonstrating the capacity of both managers to make significant in-game changes; a factor often overlooked in our obsession with whom a club might sign and play from the start.
Enrique flipped his centre-backs Javier Mascherano and Samuel Umtiti from their natural positions so they could hit long diagonal passes to deter the press they expected from City down the flanks.
Mascherano completed three times more long passes than any other player on the field. That tactic put City in "real trouble," Guardiola admitted. Sergio Aguero drifted into the wide channels, deterring the Spanish full-backs from advancing to pursue those diagonal passes as much as they wanted.
Guardiola varied the pressing: starting with less of it than Enrique had expected, but in the second half ratcheting up that aspect of City's game and operating with an extremely high defensive line as he sought a way back into the game.
"They haven't pressed as much as we thought they would and that meant we could dominate in the first half but the second is a different story," Enrique reflected.
The long-ball counter-attack - not at all typical Guardiola - was used to seek out the higher line of midfielders and Sergio Aguero, with Nicolas Otamendi and Aleksandar Kolarov releasing most of the passes from deep. At 3-1 up, City then assumed a "low-block", dropping deeper, the City manager said after the victory.
Guardiola's rapid explanations in as-yet imperfect English can be fiendishly difficult to follow but he seemed to suggest that the use of the long-ball counter attack was a way of winning with players not yet steeped enough in his philosophy to win through them alone.
"We played long balls because we are not ready to keep the ball," he said. "We are three or four months into playing a different way. When the team don't feel comfortable in (these) kinds of games, we try to play more direct. We try (to play that way) and now we realise we won against (one of) the best teams."
He name-checked Sergio Busquets as one of the most difficult to deal with and had clearly dictated that a job must be done on arguably the most dangerous opposition player.
Kevin De Bruyne, Ilkay Gundogan and David Silva collectively suffocated Busquets as the game progressed, limiting his vital capacity to dictate the game.
Uefa's passing distribution statistics demonstrated how important that strategy was. Busquets still completed more passes than any other player, bar Umtiti. The Man United supporters sneering yesterday about City having beaten a side minus Andres Iniesta were overlooking the silencing of this more significant player.
Such was the intelligence of the Guardiola plan. Now all he needs is a squad, a club and a support base that matches his belief in it. The usual excuses about British clubs' recent struggles in Europe - the intense Premier League competition or lack of a winter break - always frustrate Guardiola when they are put to him.
He is adamant that the quality is there and continually hints at a psychological deficit. He said late on Tuesday that this is what City are fighting against.
"We play against us, against our tradition and what we have to do," he observed. "When one club like Manchester City spends 25 years without being in Europe, you don't have history. History means when you face the big teams you are constant to fight against them…"
He certainly doesn't seem to see the problems that others might, with his surroundings and inheritance. The only difficulty he has had with Audenshaw, the unprepossessing east Manchester district near the Etihad where he has taken to playing golf, is how to pronounce it. ("Awdenshaw? Odenshaw?" he asked a City colleague a few weeks back.)
Among some fans there is a spiritual deficit, though. The boos for the Uefa anthem persisted on Tuesday night, despite Guardiola's bold entreaty of fans that they move on from their feud and "forget what happened in the past," as he put it back in September.
Fans were still taking up their seats 20 minutes into the game. The size of the queue for tickets just before kick-off suggested that some might be struggling to get in before half-time.
It is time for these people to catch the spirit, think big, look at this and say, 'We are a young team managed by one of the brightest individuals in football and we could win the Champions League'. As Enrique will tell them, all of the above are true.