South Africa scored an absolutely massive 29 runs in their last over which was crucial in making Pakistan crumble.
Babar Azam, the most valuable Pakistani batsman, scored 90 runs off 58 balls. That should be sufficient in a T20I chase of 189 runs. Unfortunately, the rest of the team combined scored 85 runs off 62 balls. That's how to lose a match and the series. With one game left, it's likely that the talented Azam will be the highest scorer in this series while his mediocre teammates lose every single match.