Detailed Instructions: 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.
Q: Premise: One night while walking my girlfriend home, she saw a strange shape. 
 Initial Context: I looked and realized that it's an opossum. 
 Original Ending: We went running after it. When we caught up, it stopped and stared at us. We took a few photos and then let it go on its way. 
 Counterfactual Context: I looked and realized that it's a tree.
A:
We went running after it. When we reached the tree,we realized it was very ancient. We took a few photos and then went on our way. 