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: Emma was watching fireworks over the city. 
 Initial Context: One of the fireworks appeared to explode. 
 Original Ending: A giant orange fireball flew into the air. When it landed, it sparked a huge fire. Luckily the city was able to contain it. 
 Counterfactual Context: One of the fireworks failed to explode.
Student:
A giant orange fireball did not fly into the air. When it landed, it did not spark at all. Luckily no one in the city was hurt. 