Task: Story Composition
Input (English): Premise: Johnny went surfing this weekend alone. 
 Initial Context: He knows you shouldn't surf alone, but he still went. 
 Original Ending: Johnny was having a lot of fun, until he saw a fin. He knew it was a shark, and started to paddle. He made it to the shore, looked back to see it was only a dolphin. 
 Counterfactual Context: Luckily, he didn't see any sharks while surfing alone.
Output (English): Johnny was having a lot of fun, until he saw a person floating. He knew it was a drowned person, and started to paddle. He made it to the person.