"I had to DQ someone at the IL Sectional in 2013 at Sparta, because of an issue like this. Sparta has tables at the end of their bays that have roofs over them, and those tables were marked as safe areas on some bays, but not all. I turned around to see a shooter dry firing at one of the tables that was NOT marked as a safe area. Hated to do it, because I know it was confusing, but rules are rules."
Then the MD and the entire R/O staff was wrong if they did not point out and correct this issue. Confusion is one thing we should never have about safety areas.
At my home club each safety are is marked and across the access road from the bays. Cut into a berm with railroad ties for the sides and back. Marked with permanent signs there is no mistake from shooters.