Teacher:Given a premise, an initial context, an original ending, and a counterfactual context, the task is to generate a new story ending aligned with the counterfactual context and as close to the original ending as possible. Each instance consists of a five-sentence story. The premise is the first sentence of a story, and the second sentence, which is the initial context, provides more information about the story's context and the story's general plot. The original ending is the last three sentences of the story. Also, a counterfactual context is a slight modification to the initial context. You should write a new story ending that edits the original story ending as little as possible to regain coherence with the counterfactual context. To sum up, you should write the last three sentences of a story based on the premise(first sentence) and the counterfactual context(second sentence) of the story.
Teacher: Now, understand the problem? Solve this instance: Premise: When Mitt was ten he wanted to be a pro wrestler. 
 Initial Context: He would practice on his little brother in the living room. 
 Original Ending: One day he accidentally slammed his brother on the fireplace. His dad, furious, came in yelling and told him wrestling was fake. Mitt was so crushed that he could never watch wrestling again. 
 Counterfactual Context: He would practice by himself in the living room.
Student:
One day he accidentally slammed a vase on the fireplace. His dad, furious, came in yelling and told him wrestling was fake. Mitt was so crushed that he could never watch wrestling again. 