1. Find bear.
2. Scout bear surroundings for deer.
3. Aggro bear by shooting stone at him from max range.
4. Sprint to deer, use trees and stuff to keep out of BB drain range.
5. Dance around deer and get the bear to roar once, deer will attack bear.
6. Run away and watch the deer slaughtering the bear.
Did that ever since I realized that bear BB drain aggros every living thing, even other bears. Been farming bears this way ever since I got 20~ humors, just enough to survive 2 BB drain if you stuff yourself with food.
Bonus points for leading the bear to argopelters.