Postpublished at 03:41 Greenwich Mean Time 24 March 2015
Graeme Swann
Ex-England spinner on BBC Test Match Special
"It was hit hard, he tried to thrash it. Williamson tried to take the catch high to his left and it spun him around, such was the power but it was a definite chance. De Villiers is a dangerous man to drop."
Listen to Test Match Special commentary via the audio icon.