Well that unraveled pretty quickly for South Africa - once again undone by Ashwin and Jadeja. By my research, this is South Africa's lowest Test score since they were bundled out for 72 by England back in 1957.
Edit: According to ESPN, the 79-runs is the lowest total India have ever dismissed a team for in Tests.
South Africa's impressive record of nine years and 15 away trips without losing a series finally came to an end in this series. Given how teams in the modern era struggle to win even one series away from home, this was an impressive feat and one that may not be matched for some time.