Get off
That was that, thought the flight attendant who then responded that she wanted Susan off the plane. They walked away from Susan to call for security to remove her. This was something that they could do because they were not in the air yet and they could easily open the door.
It seemed like Susan had picked the worst time possible to make threats and she looked around in rage. But her anger then turned into something else, she knew at that moment she had made a huge mistake and that it was quite possible that she was about to be booted from the plane.