In the theatre of Old Trafford, where history and rivalry press down on every moment, Manchester City were reduced to ten men before the match had properly begun — and yet they left with the only goal that mattered. Sunday's derby became less a football match than a study in collective character: how a team stripped of its usual tools finds other ones, and how numerical advantage, if not met with clarity of purpose, can dissolve into nothing. Under Enzo Maresca, City revealed something about themselves that a comfortable victory never could.