1. Red v Blue. Red fouls blue, ball goes free, another blue player gets the loose ball, I shout "Advantage, play on" with appropriate signal. He knocks it, first time, forward to a blue forward who is offside. Take the offside IDFK to red, or come back to the original foul and give a DFK to blue? I took the IDFK to red for the offside. Right or wrong?