In what scenario should a security guard abandon their post?

A security guard should abandon their post if remaining poses an immediate danger to their safety because their primary responsibility is to ensure their own safety in order to effectively protect others. If a situation arises that threatens their well-being, such as a violent incident or a natural disaster, it is crucial for the guard to prioritize their safety. Abandoning the post in such situations allows them to seek safety and potentially alert authorities or respond to the situation more effectively.

The other scenarios presented do not warrant abandoning a post as they do not involve immediate threats to safety. Boredom, a slow shift, or observing a supervisor leaving are not valid reasons to leave a post, as these situations do not compromise the guard's ability to fulfill their responsibilities or protect premises and individuals.