If you're out in the real boonies, non Polar bears just want to stay clear of you. At least the ones I've met. Closer to human habitation including campsites, all bets are off.

And yes, bears are perfectly happy to declare eminent domain over any elk, moose or deer kill, whether by humans or wolves. Hang on to your tag until it's safely loaded in your truck.

As for Nanuk, make sure you see him before he sees you. Early 20th century explorers in Hudson Bay reported that polar bears were easy to hunt. Once you spotted one, make enough noise to get its attention and it would come for you. A reliable rifle was vital.

Stephansson reported stalking a polar bear who backtracked behind him. Hearing the bear smacking his lips behind him, Stephansson had just enough time to turn around and shoot.