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 boss stood in front of his employees to give a speech. 
 Initial Context: He began the speech with a story that turned out to be a joke. 
 Original Ending: None of the employees caught on that it was a joke. No one laughed at the punchline. The boss became embarrassed and his face turned red. 
 Counterfactual Context: He began the speech and got nervous and ran off the stage.
None of the employees caught on that it was part of the script. They thought he was genuinely nervous. The boss sprang up in the crowd and shouted "boo!". 