The most logical revision for karishma to make to her prediction is that the narrator

Thank you for posting your question here at . I hope the answer will help you. Feel free to ask more questions here.
below are the choices that can be found from other sources:

gives up his plan to murder the old man.
comes back another night to murder the old man.
continues with his plan to murder the old man.
eventually admits his presence to the old man.

The best answer for me is that "comes back another night to murder the old man."