You will be given a definition of a task first, then some input of the task.
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.

Premise: The runner rounded 3rd base. 
 Initial Context: The catcher had the ball, waiting to tag the runner out. 
 Original Ending: The runner braced himself for impact. He slammed into the catcher in front of home plate. The catcher sprained his ankle in the collision. 
 Counterfactual Context: The catcher had the ball, so the runner stayed on third.
Output:
The runner kept his foot firmly on the base. He watched the catcher in front of home plate. The catcher threw the ball to the pitcher. 