I wonder why Rabada would act in that way? Sure the fair playing, non sledging Aussies wouldn't have been winding him or his team mates up would they. 
I'm guessing it's because much like david warner, he is an idiot ..an extremely talented idiot.
I'm sure the fair playing non sledging Saffas were very disappointed in Rabada because they are innocent in all things and this is the first time Rabada has ever done anything like that and its completely out of character. Please watch your step when you decide to get off that high horse.
To the actual cricket, what a day, thought Australias work in the first session was brilliant, but south africa were awesome in that second session and really wrestled the game back. Khawaja needs to be dropped and not looked at again for a few years. Genuniely rubbish outside of Australia. Good fight from Paine, another agonising reminder of what Australia has lost through all his years of injury!, he did well to post some sort of total but the Aussies will have to bowl out of their skins tomorrow to stay in this game!