Fight with a Bear (The Long Dark)

The problem is that the bear in the cave I just don't see it. Yes, and before that baganaly was passed in the towers not attacking, then suddenly he sees and climbs. Well, in the cave just doesn't see. Start the game without trainers and cheats, he passed the head of a new, still in the cave, not paying any attention to me. I tried to put a spear through. If who faced prompt what to do.