Normally this is in reference to props taking a step out to change the focus/direction of their drive (or whip the scrum round). I'm sure he has no problems with props moving forward (or backward) as long as they don't step out to drive inwards/whip the scrum round.
plus also don't move your feet BEFORE the ball comes in - then the scrum cannot move from the set.
didds
Noticed this and thought it was very strange. If they do move their feet is he going to penalise? Seems like Ref. is asking for something he cannot justify or enforce, which is not a position I would like to put myself in! !
I think he meant "stop shuffling around"
"Shuffling around" indicates an unsettled scrum with the players reacting to changing forces. Telling them to stop moving their feet doesn't solve the instability problem.