Task: Story Composition
Input (English): Premise: Jon loved to ride his bike. 
 Initial Context: One day as he was out on trail, he came across a snake. 
 Original Ending: He pedaled as fast as he could. The snake tried to run with him. Jon had never been so nervous in his life. 
 New ending: He pedaled as fast as he could. The lion tried to run with him. Jon had never been so nervous in his life. 
Output (English): One day as he was out on trail, he came across a mountain lion.