"In some ways I'd like to go and front it, but it's not really my decision."
Sanzar referees boss Lyndon Bray could not be reached for comment, but it is understood there were fears a fan might have tried to avenge South Africa's quarter-final defeat.
In an interview with the Weekend Herald, Lawrence said he had been hurt by the extent of the fall-out over the way he controlled the match that put the Springboks out of the World Cup. He accepted that his performance warranted criticism, but he could not accept the implication that his performance was biased.
The conspiracy theory that a win for Australia gave New Zealand an easier road to the Webb Ellis Cup has gained credence in South Africa.
"I got quite a few threats, people telling me if I came to South Africa to watch my back because they'd take me out," Lawrence said. "The thing that scared me most was that people would really believe I cheated deliberately and fixed the game.
"The thing I pride myself on the most is that I'm up front and honest. For people to say I didn't referee the breakdown very well, that didn't hurt at all."
It was Lawrence's handling of the breakdown, the most convoluted of rugby's laws, that created the biggest upset.
The winner of the Referee of the Year title at this year's New Zealand Rugby Awards conceded he took the wrong approach into the game.
With the benefit of hindsight, he said, he would have refereed the breakdown more "technically".
Had he done so, Wallaby flanker David Pocock might have been penalised a couple of more times than he was - but he would have also earned a lot more penalties for his team, so dominant was he in that area.