(and new shooters with inapropriate guns and novice instructors will be a separate lesson, stay tuned)
I'm on the range watching them to make sure they're safe. Stance... leaning way back, check. Grip... Charlies Angels cup-n-saucer, check. Eyes...at least one open, check. Safety briefing and "lesson" shouted through earmuffs...check. Bang. She shoots the first round, gun kicks up, she turns and has the gun pointed at his chest at an upward angle with finger solidly on the trigger. I'm mentally visualizing all the organs the bullet will pass through before it exits and hits the safety barrier. I consider disarming her, too risky. I don't want to yell or move too fast. I quietly tell her "your finger is on the trigger of that loaded pistol" and after a (3 hour or so) pause she sets the gun down.
I was too shakey to yell at them, I had to leave the range and let someone else do it.