Camquins point is a good one
As a solo ref, you won't normally check your watch when you play advantage (as this would mean taking your eyes off the live action)
So you won't normally know whether your arm went out at 79.58 or 80.02 . But you will know that you blew your whistle at 80.10.
So again, I tend to the view that if you blow your whistle to award a scrum at 80.10. .m that's the end of the game
As a solo ref, you won't normally check your watch when you play advantage (as this would mean taking your eyes off the live action)
So you won't normally know whether your arm went out at 79.58 or 80.02 . But you will know that you blew your whistle at 80.10.
So again, I tend to the view that if you blow your whistle to award a scrum at 80.10. .m that's the end of the game