Task: Story Composition
Input (English): Premise: Allen was out one night doing some Christmas shopping. 
 Initial Context: He thought he saw his friend off in the distance. 
 Original Ending: He decided to sneak up and scare him. He crept up and grabbed his friend from behind. Allen felt terrible when he realized he'd grabbed a stranger. 
 Counterfactual Context: His friend saw him off in the distance.
Output (English): He decided to sneak up and scare him. He crept up and grabbed his friend from behind. His friend laughed when he saw how scared Allen got.