The defender is slightly behind him.
Vardy put his right foot in front of the defender away from the ball.
Then as the defender is falling because Vardy's tripped him up, he hooks his left trailing leg up the back of the defender to wrap himself around him. It's actually very dangerous...
Bloody foreigners, coming over here and div . . . oh. It was a very dirty dive, one of the most conniving ones I've seen. Only a friggin idiot would defend it, oh here comes Roy.