Final answer:
The available excerpts do not give a clear answer to what John does at the end of the story, and without additional context, the ending actions of John cannot be confirmed definitively.
Step-by-step explanation:
At the end of the story, John's actions aren’t explicitly detailed in the passages given. However, throughout various narratives provided, it seems that John experiences a variety of reactions such as suspicion, preparation for an escape, and possibly locking a door for privacy. To directly answer the question based on the given options and context, there isn’t enough information in the excerpts to confirm any of the listed endings conclusively. Given the variety of contexts in the excerpts, they could belong to different stories or different parts of one story, therefore without additional context, the answer to what John does at the end of the story cannot be determined accurately.