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: A group of flies were chasing Dan to the shoreline. 
 Initial Context: He accidentally tripped on a rock and fell into the shore. 
 Original Ending: Several insects managed to get inside of his pants. They were biting my legs to a large extent. Ultimately, I had to run out of the water 
 Counterfactual Context: He sprayed some fly spray at them and killed them.
Student:
Before he had, several had managed to get inside of his pants. They were biting his legs. Ultimately he had to dive into the water. 