Here is a copy of an EYEWITNESS account of what happened that day 
"Lloyd said he noticed a large group of children playing next to him. Suddenly, one child grabbed another by the arm and hit her in the face with the back of his fist.
“The girl that was struck immediately ran out of the playground to her dad,” said Lloyd. “She was crying and holding her face.”
Her dad, who is believed to be a resident of Krugersdorp, asked what had happened, and she told him she had been hit in the face by another child.
“The man then walked calmly over to the group of children his daughter pointed out,” said Lloyd.
“I heard him introducing himself to the woman sitting among the children and saying that he had a slight problem. He then asked the woman very politely to discipline her child because he had hit the girl in the face. He also said she should please just talk to her son because ‘it’s not on’.
“Then the woman got up and told him to f**k off.”
As reported in The Citizen