One firearm at a time / one shooter at a time is fine. He is in a position to maintain close and direct supervision of the firearm in use.
Supervision means different things in different situation. A range officer can supervise many shooters at once (presuming all are licensed) as he is looking for rule compliance, range safety and behaviour. But firearm supervision you need to be close enough and watchful to stop an incident happening when an unlicensed person s operating one.
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