The misunderstanding
The ying and yang of Quinton de Kock and Hashim Amla seemed to be working well for South Africa at the top until they got one wrong. De Kock thought the single was on when he sent the third ball of the match to cover and set off immediately, even as Andre Russell swooped. Amla was hesitant at the other end but responded. Then, mid-pitch, Amla stopped but de Kock was already on his way and Amla had to follow through. He raced in but did not put in a dive and Russell's throw gave Denesh Ramdin enough time to whip off the bails.
The catch
Sulieman Benn is not known for his agility but he claimed the catch of the day when Faf du Plessis drove to him at mid-off. Benn took a few steps forward and then just reached out, holding on to the ball as he tumbled forward. Umpire Richard Kettleborough gave it out but then referred upstairs where several replays could find no conclusive evidence to overturn his decision.
The celebration
Chris Gayle brought out the West Indies celebration dance when Rilee Rossouw was caught at point but Dwayne Bravo provided the full performance when he bowled AB de Villiers. De Villiers misjudged an attempted flick through midwicket and inside-edged on to his stumps. Bravo roared in delight before getting down, part-Gangham style, part-Under 19s celebration and a whole lot of fun.
The non-celebration
But not every wicket needed a dance. When David Miller played down the wrong line and was bowled by Gayle, the big Jamaican folded his arms and put on a pensive expression. Gayle held the pose while Ramdin and Darren Sammy clambered over him to leave South Africa wondering what more could go wrong.
The other celebration
In the absence of Dale Steyn, the title of South Africa spearhead has fallen to Kagiso Rabada and he does not appear to be overawed by the extra responsibility. Quite the opposite. Gayle sent the first ball he faced from Rabada for four but Rabada came back with a ripper. He got late swing on his next delivery, which Gayle tried to push down the ground. Gayle missed, Rabada found his off stump and raised both arms in the air in celebration. It was not a gesture of ecstasy or anger, just sweet, sweet relief.
The bigger misunderstanding
South Africa frustrated West Indies' big-hitters by taking pace off the ball and Andre Fletcher was particularly tetchy. He wanted a run after Johnson Charles played a ball into the off side but Charles was not quite as keen. He saw Rossouw gallop to gather the ball and tried to send Fletcher back but he had already traveled more than half the length of the pitch. Fletcher slipped as Rossouw made his move, which only worsened his chances of making it back, but even if he had turned, he would not have beaten the throw. Rossouw hurled it in and the ball took the bails off, nearly striking de Villiers as he moved in to collect. For once, de Villiers wasn't needed and South Africa had reason to believe.

Firdose Moonda is ESPNcricinfo's South Africa correspondent