Task: Story Composition
Input (English): Premise: One day at the zoo, I walked over to the gorilla enclosure. 
 Initial Context: A large male silverback gorilla walked out from the corner. 
 Original Ending: He sat in the center of the viewing area, as if posing. He glared angrily at me the entire time I was there. I felt very guilty, like I shouldn't be there looking at him. 
 Counterfactual Context: Unfortunately, no gorillas could be seen, perhaps because they were sleeping.
Output (English): Suddenly a large male silverback walked out of an entryway. He glared angrily at me the entire time I was there. I felt very guilty, like I shouldn't be there looking at him.