I have seen refs warn the 9, threaten to give a free kick, but bottle it and not do so despite persistent infringements.
It’s a penalty offence? No wonder refs are reluctant to blow. Make it a free kick and I’ll bet they’ll blow more often.
Is it? I thought it was just a free kick offence?
It’s neither pen or free kick, the sanction is a scrum awarded to the opposition. Law 15.17 Ending a ruck. “When the ball has been clearly won by a team at the ruck, and is available to be played, the referee calls “use it”, after which the ball must be played away from the ruck within (note within, not after) five seconds. Sanction: Scrum”