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: I was playing football with my friend at the park. He threw the ball to me and I caught it. When I returned the ball, it flew away from him. It ended up hitting a lady. She immediately fell down.
 selected sentence: When I returned the ball, it flew away from him.

I catch the ball >Causes/Enables> I return the ball