It caused confusion again today with Bullies nominating non-ruckman for the role and leaving Goldstein absolutely perplexed. So the non-ruckman is stopped from contesting the ruck and doggies get a free. I don't recall if Goldstein was left entirely unattended, but if he had someone next to him, then that too would have been a non-ruckman interfering in the ruck.
Maybe the best response by the umps is just to call it back, point out who the ruckmen are, and do it again. Because otherwise it will give Margetts another way to screw us in the derby.