The pair walked out knowing the target was well within reach after England produced a relentless bowling display to dismiss South Africa for just 69 under 21 overs, their third-lowest ODI total and their second-lowest ever in a World Cup match.
The previous record was held by Imran Tahir, whose tally of 61 wickets was surpassed by Dale Steyn after taking the wicket of Jos Buttler.
Chasing 178, England were cruising in the first half of their innings before experiencing a middle-order collapse against South Africa in the first T20I.
Dale Steyn last played an international fixture was in March last year when he appeared for the Proteas in a T20I game against Sri Lanka.
Despite Quinton de Kock's brilliance, the highlight of the third day's play between South Africa and England was the batting of nightwatchman Anrich Nortje.
Kagiso Rabada has now accumulated four demerit points in a 24 month period and will miss South Africa's next Test match against England.
The series is currently tied at 1-1 with South Africa winning the first Test and the guests bagging the second.
Openers Dominic Sibley (30*) and Zak Crawley (20*) were at the crease when the umpires called for Lunch on Thursday.
Joe Root stayed at the team hotel while the players sweated it out on the field for the third Test of the four-match series which will begin on January 22.
South Africa were 170 for 4 with Rassie van der Dussen (1*) holding the other end when the umpires called for Lunch.
