Jaque Fourie sees yellow.

The assistant referee calls the referee's attention to a tackle by Fourie of South Africa on Richard Brown of Australia. The assistant tells the referee what happened and when the referee asks for his recommendation, the assistant recommends a yellow card, which is what happens.

Just after Brown has passed the ball, Fourie bends down, lifts him up at the thighs, stands up and drops him so that Brown' head and shoulders make first contact with the ground.

Law-makers have become increasingly concerned about this kind of tackle which has found its way into law.

Law 10.4 (j) Lifting a player from the ground and dropping or driving that player into the ground whilst that player’s feet are still off the ground such that the player’s head and/or upper body come into contact with the ground first is dangerous play.
Sanction: Penalty kick

That is the law.  The commentator says that he does not drive Brown into the ground but just dropping him is enough  to constitute a dangerous tackle.

There are four elements - grip, lift, turn and either drop or drive downwards.

The IRB is concerned about dangerous tackles and says:

Dangerous Tackles – To be treated at the upper end of foul play scale (red card, and work down, not the reverse)
·  High
·  No Arms
·  Spear
·  Tackle on the collar
·  Any player who puts a player in the air or caused a player to be put in the air has a responsibility to ensure that the player is brought to the ground safely.

The IRB has a suggested tariff of punishments.

Lifting a Player from the ground and either dropping or driving that Player’s head and/or upper body first into the ground whilst the Player’s feet are off the ground

Recommended suspension depending on gravity:

Lower end: 3 weeks
Mid range: 6 weeks
Top end: 10+ weeks
Maximum: 52 weeks