My only comment is to not raise your voice, don't yell. I may be off-base here, but to me it implies anger and loss of control. When dealing with firearms I prefer to stay cold.

Muzzle discipline and trigger fingers are my main issues. A shooter should always know where the gun is pointed, loaded or unloaded. You never sweep a friendly (defined as anything you don't want to shoot).

The trigger finger only needs to contact the trigger when you have made the decision to fire. Once you decide to not fire or there's an issue you need to discuss with the RO (or Dad), the first thing that happens is the finger comes off the trigger and the safety is engaged. You might want to raise that finger to make the point of where it's not. Then you talk to Dad.

Whatever, I'm not an RO, just a shooter who's never (at least not yet) had an ND or an AD. Just tossing in my $.02