Manchester City had just inflicted the heaviest defeat of his managerial career, yet Sir Alex Ferguson seemed surprisingly calm when speaking to Sky Sports after the game
"When we went down to 4-1 we should've just said 'we've had our day', but we kept attacking, full-backs forward, and they were attacking with three against two," Ferguson said. "It was crazy, crazy football."
Ferguson was of course talking about the 6-1 mauling his Manchester United side had suffered at the hands of City in October 2011. City had only been 3-1 up as the game entered injury time, but when an ill-disciplined United went all-out to try and rescue the game, the Blues ruthlessly exploited the holes in their defence.
"It's ok playing with the history book, but sometimes there just has to be common sense about it," admitted Ferguson.
By 'history book', the manager was referring to United's reputation for pulling off dramatic comebacks and refusing not to attack. 'The United way', Old Trafford regulars call it.
No one can deny that this is true - the 1999 Champions League final is a prime example - but over the years, United, their players and managers have developed an inflated view of themselves as some kind of dominating force that has a divine right to go all-out-attack whenever they want to without consequence.
Ferguson, the brilliant coach that he was (as a City fan it hurts to admit that, but it's true), largely stopped that feeling of self-importance from tripping United up. The 6-1 was a rare example of delusions of grandeur getting the better of them.
"Any Man United supporter knows that anything can happen," United boss Ole Gunnar Solskjaer said in the wake of his side's 3-2 comeback win against Atalanta on Wednesday. "Champions League nights, Premier League, it doesn't matter - we've done this so many times."
It's that kind of attitude that will keep City as top dogs in Manchester for years to come. Under Guardiola, City are smart. Yes, they always believe that they can win, but if a game is going against them, they don't decide to go gung-ho and throw bodies forward. The rarity of heavy defeats - the last was a 3-0 loss to Liverpool in 2018 - proves that.
United are the opposite. Beating them 6-1 ultimately won City the title in 2011/12, but over the long term, the result had an even more significant effect on United's psyche. Since 23 October 2011, United have been more wrapped up in their own narrative that they must relentlessly attack and win than ever before.
Ten years on, that mindset has manifested itself in manager Solskjaer. He has little by way of a tactical plan or a defined style of play, other than to give the ball to the likes of Marcus Rashford, Bruno Fernandes and Cristiano Ronaldo in the hope that they will produce something from nothing.
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Solskjaer's side rarely exact control over games or make tactical adjustments to counter their opponent's strengths - after all, a team with a birthright to win doesn't need to dwell on such insignificant details. It's telling that United play their best football when starting from a losing position when they can just chuck everyone forward and not worry about tactics.
United believing that they can - and should - always win is what allowed City to run riot in the final four minutes of the 6-1.
You'd think that such a humbling defeat would have taught them a lesson, but apparently not. In scoring those three late goals, two from Edin Dzeko and one from David Silva, City highlighted United's fatal flaw; their misplaced self-belief.
City have and will continue to exploit that.