Task: Story Composition
Input (English): Premise: Karl was a good baseball player in his youth. 
 Initial Context: As a middle-aged man, he joined an adult baseball team. 
 Original Ending: Karl is very competitive and will do anything to win. One day, he slid into second base to beat a throw and hurt his knee. The injury made Karl realize that he wasn't young anymore. 
 New ending: Karl is very competitive and will do anything to win. One day he slid into second base to beat a throw and hurt his knee. The injury made Karl realize that he is not invincible. 
Output (English): As a middle schooler, he joined the school's baseball team.