Have you ever simply fled the scene of a meeting gone wrong?
Don’t fold up your tent just yet.
Ask what you’ve said or done that was a problem.
Let the prospect “dump.”
When you find yourself in a tense or awkward situation, you should not help the person end the meeting. Instead, make an effort to figure out what's going on. The prospect may have an agenda item that you don't know about, and a single "dumb".