Task: Story Composition
Input (English): Premise: A man took a hike in the woods with no destination in mind. 
 Initial Context: He came across a tall wall in the middle of the woods. 
 Original Ending: The man tried to climb over it but it was too tall. He picked up a rock and tossed it over. The rock hit the ground and a voice asked who threw it. 
 Counterfactual Context: He came across a large mountain lion in the middle of the woods.
Output (English): The man tried to back away from it but it saw him. He picked up a rock and tossed it over. The rock hit the ground and the mountain lion growled.