Problem I've had with bears is the BB drain continues for a little bit after you're already out of combat. I ran into my house and still had the fear debuff. Make sure if you have to run you do so with plenty of BB left.
The sweat and blood shed by its people had established a strong foundation upon which the most powerful entity in the world would be built.
if you work with atleast 1 more person about 40 un buffed humor is fine. as 40yb 40b you can survive a few high hits from bears so long as you use gaurd and watch your reel/imbalance (as those will increase bear's dps)
to solo bears you need around 50yb/B to survive solo against the bear. as well you need 55+BB to withstand fear at that level DO NOT fight bears without a full BB bar as even at my BB levels i still get hit by fear if i move to far away from the bear for whatever reason and that can still ko you even with 100 humors lol.
so get around 50bb 40-50+yb/b and thrust to fight a bear then its just practice and reading the bear's movements.