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: Ada watched a red robin land on her lawn. It hopped around happily. Then it bent its head and skewered a worm! It swallowed the worm hungrily. Ada was a little taken aback by nature's violence!
 selected sentence: Ada was a little taken aback by nature's violence!

The robin eats the worm >Causes/Enables> Ada is taken aback