U14 Boys, skilled players. Both ARs are experienced, several years as referees. Play is near midfield, and Red attacker 1 plays a ball through, cutting deep behind the defense. Red 2 and Red 3 take off after the ball (along with the green defenders) - from my position as center, it appeared that either Red 2 or Red 3 could have been in an offside position. Both Red 2 and Red 3 have a good chance to reach and play the ball. AR flags for offside immediately - and I think to myself "Damn! He hasn't waited for definite involvement, which one was offside?" The problem - I don't know whether one of the attackers is onside, and if I stop play now, I may take his great scoring chance away. I allowed play to continue, and Red 2 collects the ball and scores. I make no signal at this point and run over to confer with the AR. He is still in position where he flagged, but his flag is now down. I ask which player was offside, and he indicates that Red 2, the player who received the ball and scored, was in an offside position. I say, "Thank you - remember, keep your flag up!", and now, loudly "Offside - the player who scored was offside!" and put my hand up to indicate the IDFK. A brief explanation to the attackers and defenders, and we got underway again. I ended up with a good result, and got the call correct, I see potential problems with what I did. Am I masterminding my AR by deciding that he might have made a mistake and allowing play to continue? What do I do if the ball doesn't go out of play quickly, have I endplayed myself into accepting an offside play? What are the AR's options in this situation - how can he communicate during active play whether he flagged the wrong player too quickly, or if an offside player definitely became involved?