When pasting, my etiquette for scoring errors is that if something looks wrong and could help the shooter, say something. If something looks wrong and the shooter got a lucky break, paste it.
I don't know if that is the best etiquette, but I have seen fireworks when a shooter feels like somebody else is looking close to make sure he does not miss getting a score reduction.
I don't know if that is the best etiquette, but I have seen fireworks when a shooter feels like somebody else is looking close to make sure he does not miss getting a score reduction.