Red (6 players) have scrum in Blue 22. The two backs are split. Blue have 2 on 1 on one side.Advantage.... 2 v 1, irregardless of proximity of goal line in 7's should be gained advantage. IMHO
Scrum infringement and Blue 9 grabs ball. Do you call the 2 on 1 advantage over now? Do you wait until the ball is passed? Do you wait until the ball is caught?
I distrust automatic calls. Trust your judgement. Sometimes it will be "wrong". That's how you get better. You build a mental portfolio.