The goal that was disallowed, until somebody looked again
Ninety-first minute, the tie level, and the striker turns the ball into the net. The stadium erupts — and then the flag goes up. Offside. The referee jogs over, points to the centre circle, and waves it off. On the pitch it looks final: the man in charge has decided, the game restarts, everyone is expected to accept it and move on.
Except the striker doesn't argue with the referee. Arguing louder never changed a call. Instead the decision goes to review. Someone draws the line across the frozen frame — the exact line, on the exact moment the pass was played — and there it is: the last defender had him onside by the width of a boot. The call was wrong. Not unlucky. Wrong. The screen flashes, the referee reverses himself, and the goal stands.
Same striker, same goal, same evidence that was on the pitch all along. What changed was that someone was allowed to look again — on the record, against the rules, before the whistle made it permanent.
A refusal is that raised flag. It looks final and it isn't — a wrong call can be reviewed and reversed. But the review has a window, and once the final whistle goes it's over for good. An appeal is asking, in time and on the record, for someone to look at the line again.

