They killed 15-year-old Raymond Buys at the Echo Wild Game Rangers camp, designed to turn boys into men, in 2011.
“Accused one [De Koker] was a pathetic witness,” magistrate Retha Willemse said.
It was “absurd” for him to have claimed that he was not aware of Buys’s injuries.
“Accused one tried to mislead the court. De Koker didn’t want Buys to return to his mother, because he was benefiting financially from having Buys at the camp,” she said.
Willemse found Erasmus was a willing participant in the abuse.
“The testimony of accused two that he followed instructions because he didn’t have any other option is rejected by the court.
“Accused two didn’t just follow instructions from accused one to abuse Buys, but also did it out of his own initiative.”
The fact that accommodation was provided for Erasmus and his girlfriend and that a bank account was opened for him, was motivation for him to continue what he was doing, she said.
Earlier, Willemse detailed the abuse meted out to Buys.
He was punched, struck with a spade, a stick, and a “piele wapper” (60cm-long rubber pipe). He was forced to eat soap powder, pick up his own faeces with his mouth and was kicked and slapped while unconscious to “wake him up”.
Witnesses testified that during his time at the camp, Buys was dirty, neglected and would soil himself. He could not walk properly and often collapsed.
They testified that De Koker would physically abuse Buys, claiming he was lazy, had a bad attitude and would pick at his wounds. He allegedly tried to commit suicide, which is why he was chained to his bed.
A doctor who examined Buys when he was admitted to hospital, a day before his death, found he was emaciated, had cigarette burns, was brain damaged and in a deep coma, had a broken arm, and signs of kidney failure.
He testified that some of the injuries were up to a month old and the worst he had ever seen.
After the judgment, Buys’s mother Wilna burst into tears in the front row of the public gallery.
Erasmus went to the back of the court room to hold his five-day-old daughter.