It is now a standard practice for players to execute a roll (or two) after the tackle to gain ground, buy time for support to arrive and prevent the ops from getting hands on the ball.
Has anyone ever seen even an admonition from a referee?
I don't let them do that.
If it prevents the oppo from getting the ball I PK it first time. If the only effect was to steal an unimportant metre i would have a word first time, and the PK if they keep doing it