We had a simular situation a few years ago. Cheerleading Coach had cussed out an Official for asking her to move from the sideline. I was then asked to take her sideline in the next game at that site. Before kickoff, I went over and kindly asked her to keep back a few steps during the game. "In our last game the official on the home team sideline ran over one of the cheerleaders, she is in the hospital right now fighting for her life." "Really?" "Naw, just kidding, I don't want anyone hurt so please step back, so that I don't become the truck and one of your girls doesn't become the armadillo."
Maybe I'm better looking than the last Official that officated there. She promptly moved her cheerleaders back and out of the way. I then went up to the other side and asked them to do the same. Clean sideline all day.