Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Leo is walking home. He sees a dog stuck in a tree. He frees the dog from the tree. The dog runs off. Leo saved the dog's life.
 selected sentence: The dog runs off.

Leo frees the dog from the tree >Causes/Enables> The dog runs off