Task: Story Composition
Input (English): Premise: Mark was with his son at the library. 
 Initial Context: Suddenly, he noticed a man walking around with a big bag. 
 Original Ending: The man approached Mark and his son. He offered the little boy a toy from the bag. Mark thanked the man as his son picked a toy. 
 New ending: The policeman approached Mark and his son. He offered the little boy a toy from the bag because the boy was scared. Mark thanked the man as his son picked a toy. 
Output (English): Mark called the police and they found a small bomb in the bag.