Ron, do you have a safety talk before starting work each day? The two organizations I've done work with start the day with a safety talk. It is the same one and is repetitious, but they have to do it because the crew members change each day and usually totally new people turn up.
Then when we break up, the sawyer is in charge of the people working around him/her. That is made clear during the initial meeting. The first rule in sawing is to make sure everybody is clear, and stays clear.
When I've been called to be a lookout on a road during hazard tree falling, the same goes. The sawyer basically assigns everybody a spot to be in, and STAY at.
They are firm, but polite. They have to be.