West Ham were losing 0-1 to Southampton when Zaza lost control of the ball in the Southampton penalty area in a challenge with a Southampton defender. He decides to dive, to try to win a penalty for West Ham. The replay shows that he was not tripped.
The referee sees through Zaza attempt to con everyone and books the West Ham player, so no penalty is awarded. Southampton won 0-3 but had West Ham got a penalty and scored to level at 1-1 who knows what might have happened?