don't have the source , but i got it from vechia signora
pratically it says
What happens when a player goes out of the field without the authorization of the reffere and enters in the same way ?
Wha should the reff do ?
Unless the player has left the field in case of a decision of the reff , (in wich case he should considered expelled from the game , red card) , he will stop the game and will book the player , for the so called going out and in the field without his permission . The game will start with a free kick in the inderect position where the ball was in the moment the game was stopped
I remember someone posting something about players cannot leave the field to gain a tactical advantage in the game , but can't find it anymore