Task: Story Composition
Input (English): Premise: There once was a runner who was great at his sport. 
 Initial Context: He could outrun everyone. 
 Original Ending: However, his son grew up to be almost as fast as him. When he finally raced his son, he cheated to win. He felt awful in the end. 
 Counterfactual Context: He was disappointed that his son was a slow runner.
Output (English): His son grew up to be much slower than him. When he finally raced his son, he easily won. He felt awful in the end.