The voice of the AR is heard in the land.

There is a scrum to Australia. The referee sets the scrum and the voice of his assistant is heard, talking to the referee: " George, South Africa had only seven in the scrum."

The assistant referee had said this earlier as well, saying: "Green No.8 did not pack down."

On both occasions the assistant referee was right.
On both occasions the referee took no action.
On both occasions the referee was right.

At the time of these two statements, Jaque Fourie of South Africa was in the sin bin. They had only 14 players on the field and opted to have a forward in the backline on Australia's ball, packing down 3-4.

There was nothing wrong with that.

Law 20.1 (e) Number of players: eight. A scrum must have eight players from each team. All eight players must stay bound to the scrum until it ends. Each front row must have three players in it, no more and no less. Two locks must form the second row.
Sanction: Penalty kick

Exception: When a team is reduced to fewer than fifteen for any reason, then the number of players of each team in the scrum may be similarly reduced. Where a permitted reduction is made by one team, there is no requirement for the other team to make a similar reduction. However, a team must not have fewer than five players in the scrum.
Sanction: Penalty kick