It's not a bear, but I read about it in a book by an African PH -- Two couples rented a cabin in a government park (in Africa, don't remember where) to stay for a while. No hunting was allowed, but one guy took along a rifle, .243 I think. The cabin had coverings over the windows like a storm shutter, but hinged at the top. They had the shutters open to sleep in the breeze. On guy is startled awake by a commotion and sees a leopard has joined them. He is unarmed, the leopard is trying to get his wife, so he pounds the leopard's head with his fist. Meanwhile, the friend with the rifle is up and getting it out.
The leopard turns and chowmps down on the guy's hand. His friend takes the rifle and shoots the leopard in the head, and through is buddy's hand. Wish I could remember the book.