Juulie - on your original case, did your partner think the shooter actually violated according to rule, or did he think what the shooter did was a violation? Clarifying that point certainly is reason enough for a huddle and a correction if there was a wrong rule interpretation.
However, if it was just his judgement that there was an actual violation by rule, I would go with it and just tell him that from now, that's your call.
Of course, this would never happen in a game we were doing together.