Among the extraordinary images from the Etihad Stadium during Thursday's Champions League quarter-final, perhaps the most revealing was the footage of Pep Guardiola filmed in the dying moments.
As Raheem Sterling's shot hits the back of the Spurs net in added time, the Manchester City manager loses all self-control. He shrieks, punches the air, leaps into the arms of a coach. His grin lights up the stadium. And no wonder — here is the second everything he has worked for appears to have reached fruition, confirmation of his philosophy, a moment of genuine ecstasy.
Then, as it dawns on him that the video assistant referee has ruled out the goal, he sinks to his knees, his mouth hanging agape before he puts his head in his hands.
Eventually he struggles back to his feet and — with his ambition crumbling to dust in front of his eyes — the next thing he does is remove his cardigan.
But though he looks as if he is about to engage in a street fight with anyone who wants it, he is not seeking a scrap. Rather, as chaos reigns, at the moment everything he has strived to achieve collapses, he is seeking to control the one thing he can: his wardrobe.