In 1985, the country was in a state of emergency as banned liberation parties, including the now ruling African National Congress, sought to ratchet up political pressure and overthrow white-minority rule.
At a funeral in July of that year on the outskirts of Johannesburg, archived video footage shows Tutu, clearly visible in his purple clerical robes, stepping in to push back against angry young mourners who were beating and kicking a defenseless man curled up in the fetal position on the dusty ground.Accused of being an apartheid collaborator, the man is doused with petrol and is moments away from being "necklaced" - the term used to describe having a tire placed around your neck, doused with flammable liquid and then set alight.
The intervention of Tutu and other clergy save the man.
"To see that and to see him going in. There were so many things striking about it," Nontombi told Reuters outside the family residence in Cape Town.
"One was that he had the courage to go into the crowd and say: 'No, this is not how we do it'. But, the other is that those young people listened ... There was still that respect for Daddy and the other clergy ... That is my proudest moment, that whenever I think what made me proud of Daddy that is the thing that I always go to," she said.