A (football) player on a yellow card commits a foul worthy of another yellow card. The referee allows play to continue to allow for an advantage (with the intention of second booking the cautioned player at a convenient break in the play). The advantage elapses over a lengthy period of time but the ball does not go out of play nor is play stopped for any other reason. As play continues, the ball goes down the other end and the cautioned player actually scores. What do you do?