In the first act of The Empire Strikes Back, Luke Skywalker is attacked and captured by a large bipedal creature called a wampa that hangs him unconscious from the roof of its lair in anticipation, it seems, of eating him. Luke awakens, retrieves his light saber, frees himself, and chops off the creature’s arm. He then runs out of the cave onto the icy wastes of Hoth and nearly freezes to death.
Why? Why does he run out of the cave? He still has the light saber. Killing the wampa would have been trivial (it may have been dying from exsanguination already). The cave was sheltered, comparatively warm, potentially contained food. And yet he flees. Help me understand.