keep calm. I met a wolf in PL some years ago. I was alone and he (a young male) was just curious. I felt no fear, just respect.
With the bear it was both easier and... scarier. Easier, because there were other people. Scarier... because there were other people who thought they were in a zoo and started to approach the bear for a better photo.
Unfortunately, there is always a "hero" who doesn't even realize that his behavior could endanger someone else.
!ALIVE