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: I noticed a huge alligator swimming in our canal behind our house. 
 Initial Context: There was a small duck swimming towards the alligator. 
 Original Ending: I held my breath, waiting for the inevitable to happen. The duck swam closer and closer towards the gators mouth! The alligator slowly turned away from the duck, swimming away. 
 Counterfactual Context: There was a small fish swimming towards the alligator.
I held my breath, waiting for the inevitable to happen. The fish swam closer and closer towards the gators mouth! The alligator slowly turned away from the fish, swimming away. 