The Highveld team led 14-6 at halftime through converted tries from Kwagga Smith and skipper Warren Whiteley.
The reliable boot of SP Marais kept the home side in the match with four successful penalties and although they didn’t have things their own way for much of the game, they managed to keep within touching distance of the visitors.
In the last play of the match in stoppage time, Jantjies, who had come onto the pitch to replace scrumhalf Jano Vermaak, burst through a gap in the defence to score the try that brought the DHL Stormers level. Marais kicked the winning points with his easy conversion to secure a stunning turnaround win for the jubilant Capetonians.
DHL Stormers (6) 19 - Try: Herschel Jantjies; Conversion: SP Marais; Penalties: Marais (4).
Emirates Lions (14) 17 - Tries: Kwagga Smith, Warren Whiteley; Conversions: Elton Jantjies (2); Penalty: Jantjies.