It was always going to be hard to break down an improved Bok defence in the final 10 minutes with a man down and the home side held on for the series win.
"Being behind by only 12 points down and not 24 points helped a bit, but we got our composure back quicker than last week", Erasmus told reporters.
"We're a bit like a broken auto at the moment - we fix something then something else breaks".
Eddie Jones described England's 23-12 loss to South Africa in Saturday's second test in Bloemfontein as being "like a horror movie" as poor discipline led to a series loss and a fifth straight test defeat.
Franco Mostert of the Springboks during the 2018 Castle Lager Incoming Series match between South Africa and England.
Asked about an apparent scuffle between the England team and the Boks, Jones said: "Both teams wanted to win the game and England v South Africa are always tough games. I am excited about where we are going to go and I realise it is a tough time and I realise our fans and supporters will be disappointed, but all I can assure you is that we will be doing everything that we can, every minute of the day to turn this team around", the 58-year-old said. Nearly a rerun of last week. "But we will try a few new things because now we have the opportunity to put different guys in different positions under pressure".
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Ben Youngs showed his frustration by cutting short his interview with Sky Sports Gail Davies and showed the whole world that he and his teammates are struggling to deal with the mental pressure this losing streak has put them under.
Youngs, the Leicester scrum-half, was also the centre of controversy after giving a curt answer to a question during a post-match broadcast interview.
"This team has a lot of pride, we've won back-to-back Six Nations, equalled the record for wins", said Jones. "Everyone is going to fight hard to get out of this and you'll see an absolutely spirited effort in Cape Town". Alec Hepburn will join England for the third Test.
Vunipola will return for family reasons, which were agreed before the tour.
Vunipola is heading back to the United Kingdom to attend the birth of his first child, Press Association Sport understands.
Another loosehead prop, Ellis Genge, will also miss the Cape Town Test as a training-ground injury has ruled him out.