Explain to me what this story is about. i dont get it at all.

The story is about a girl named Kate, who was trapped in an airport after random, unknown, electromagnetic force fields were activated. This caused many other people to also be trapped inside the airport with her. After a long time of desperation and frustration, Kate decides to try escaping the electromagnetic fields with a simple yet, proved to be effective at the end, method. After been able to escape she decides to leave the piece of glass that she used to open the door in order to help the others. After that the story ends with the words of someone who also made it out of the force field.