Task: Story Composition
Input (English): Premise: A mountain climber went to the top of the highest peak around. 
 Initial Context: He danced for joy when he was at the summit. 
 Original Ending: His dancing caused some rocks to slide down the mountain. The climber slipped and fell with the rocks. A tree stopped the climber's tumble and saved his life. 
 Counterfactual Context: He sat quietly at the top of the summit.
Output (English): He saw some rocks slide down the mountain. The climber stood and slipped and fell with the rocks. A tree stopped the climber's tumble and saved his life.