Had a game a couple years back in a rural school. The cheerleaders were standing along the sideline opposite benches. They started off about 3-5 feet off the floor, but kept drifting toward the sideline. On my way past one time down I asked them to move back. The next time down the floor my parter inadvertently ran one of them over.
Folks on the sidelines may not interfere with the players on the floor, but they can endanger the crew if we have to swing wide and run out of bounds.
BTW, my partner stopped long enough to make sure the girl was okay and overheard one of the other girls say to her fallen commrade, "He told you to move back."