Task: Story Composition
Input (English): Premise: Ronnie was a college pitcher who was struggling on the mound. 
 Initial Context: His pitching coach took him aside at practice one day. 
 Original Ending: He showed him how to throw a screwball. Ronnie practiced the screwball for hours on end. In his next start he struck out 11 of the 15 batters he faced. 
 Counterfactual Context: Ronnie hurt his arm and had to sit out.
Output (English): It was because he was trying to throw a screwball. Ronnie had practiced the screwball for hours on end. In the end, he overworked his arm and caused a sprain.