Task: Story Composition
Input (English): Premise: Brian sped down the street in his new car. 
 Initial Context: His foot pressed down hard on the pedal. 
 Original Ending: The engine roared. Suddenly, Brian heard a siren and saw red flashing lights. He groaned and pulled over. 
 Counterfactual Context: His foot pressed down carefully on the pedal.
Output (English): The engine was silent. Suddenly, Brian heard a siren and saw red flashing lights. He groaned and pulled over.