In the charged atmosphere of Old Trafford, a single goal has reopened enduring questions about the limits of technological certainty in sport. Pro Ref, the Premier League's refereeing authority, has conceded that a VAR error allowed Erling Haaland's winning goal for Manchester City to stand in the Manchester derby, despite Enzo Fernandez appearing to be in an offside position that influenced the play around him. The admission arrives too late to alter the result, but it lands in a long conversation about whether the tools built to eliminate human error have simply relocated it.