This was a cynical foul from Greyling. His first piece of good fortune was to "only" receive a yellow card. An attack like that to the head deserved a red card.
But his second piece of good fortune came at the Sanzar judiciary which sentenced him to a two-week suspension. Why do we call it daft? Well; although the Springboks have two games left in the Rugby Championship, the two-week suspension will see him miss only one game; that's bizarre.
Greyling's thuggery should have seen him excluded from the rest of the Rugby Championship full-stop. His act was bad enough that Springbok coach Heyneke Meyer to apologise after the match. Here's hoping that Meyer's actions match his words, and that the South African team management does what Sanzar's judiciary ought to have; ensured that Greyling plays no further part in this series.