May I ask what relevance this statement has?
Because it's true.... Obviously the range visitor could not hear the rounds going off, let alone the make ready command, stand by, beep, With electric ears I swear I can hear the guy loading on the next stage over. But any RO knows that when you are running a walled stage, shoot house, blind house, clearing a house, area behind the house, that the last person off the stage is the RO. Personally I have the score keeper clear myself as the RO off a stage like that. For ROing the Police games, we hold the squad captain responsible for a nose count on a stage like that, if all the shooters are not presented or accounted for, we sweep the area again.