The ICC announced on Monday morning that Rabada, who rattled through the Australian batting line-up and now has six wickets in their second innings, will have to answer a Level 1 offence for his send-off of controversial opener David Warner on Sunday.
On Sunday, Rabada clean-bowled Warner for 13 with a superb delivery that jagged back into the left-hander and hit his off-stump.
"We still need another 60 or 70 runs to put pressure on South Africa".
De Villiers took nearly two years out of the Test arena to concentrate on the shorter formats of the game and spend more time with his young family but came back in December.
AB de Villiers showed how much Test cricket had missed him for a year as marched strongly against Australia's incisive bowling attack and punished them stroke by stroke. "So you know you have to get to him quickly and it's important that some of our players get around KG before he gets close to the batsman", De Villiers said on Sunday.
With the International Cricket Council clamping down on physical contact between players, Rabada has been charged with a Level Two offence, which carries with it a sanction of at least three demerit points, which would take him to eight points, the threshold for a second suspension, which would automatically be for two Tests, therefore ruling him out of the rest of the series.
Amla was out for 56, opener Dean Elgar followed next over for 57, and allrounder Mitchell Marsh picked up two wickets as Australia's bowlers went on a run of four wickets for 28 runs after tea.
Earlier, Vernon Philander (36) and Maharaj (30) helped De Villiers add 84 for the eighth wicket and 58 for the ninth wicket as South Africa dominated a sunny morning.
It was a near-identical replay to the spray he gave Smith, but on this occasion he didn't brush the batsman's shoulder.
Rabada, recently ranked the No. 1 bowler in test cricket, has also previously been disciplined three times for his actions after dismissing batsmen and served a one-test ban in England a year ago.
Khawaja produced his second highest score outside Australia, only to fall to Kagiso Rabada on 75 with seven minutes of play remaining.
"It'd be handy for us not to have to face him", Saker said.
Even though Elgar and Amla put on 88 for South Africa for the third wicket, that stand took almost 3 1/2 hours and 278 balls.
Quinton de Kock fell victim to a sensational delivery from Nathan Lyon that turned sharply and reared off the deck, beating the outside edge and kissing the top of off stump.
"I was very nervous in the 90s. I've been through quite a lot getting to this moment and I've worked very hard, so I feel very chuffed", said the 34-year-old. He returned to tests late a year ago.
"It felt like we were embarrassed in a way on our home soil, so we felt like it was time for us to really get up for it and turn it around".
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