He: I am leaving. Keep it there.
She: What to keep? (thinking)
Either this could be a continuation of something they were talking about. If so, it is she who missed to catch it up. A tube-light girl.
Then the other possibility is, himself referring to something in his mind or something which he told her hours/days back. And he failed to communicate it properly. He is assuming that she knows the situation as he does and expects her to catch it up.
I have no ways to help the tube light girl as of now.. do you have any idea..?
Then on the other side, isn’t it very jerky to start the conversation without a single mention on the context. They start all of a sudden and give the listener a tougher time to cope with them.
The telepathic may dig into your mind and read what is unsaid. But we, all are not telepathic and can’t decode your words.
While communicating or listening, let us keep an eye on the context too and make it a smoother conversation.