In Minnesota party hunting is legal. I have always hunted with my dad and uncle and we always go through the what ifs. We tell each other if you hear shooting then in 5 minutes hear 2 quik shots that mean don't shoot horns. Party hunting obviously wasn't legal for your friend, but if it happend to me I would shoot. Trophys are few and far between where we rifle hunt , plus lots of hunters around the property. We never shoot more deer than we have tags for. I know my dad or my uncle would not be mad if I used there tag for a trophy. If it is legal than it is not poaching.