It's the houmfort. They're trying to get her back.

5 seconds sound clip from the I Walked with a Zombie movie soundboard.

You can hear this line at 01:01:47.441 in the Blu-ray version of the movie.

Quote context

[...]

- But I am not an imaginative or fanciful woman, Doctor.

- As I understand it, in order to turn a person into a zombie whether by poison or hocus-pocus, you must first kill that person. Is that right?

- Yes.

- She was feverish. She was delirious. But I don't remember her dying, or even being in a state resembling death. No coma, nothing.

- I'm afraid you are an imaginative woman.

- Of course. Of course.

- Jessica! Jessica! She won't obey me. Jessica!

- It's the houmfort. They're trying to get her back.

- But how can they? How could they make her understand? How would she know?

- They know how. They have charms that can draw a man halfway around the world. Obeah tricks, magic... everybody knows that.

- We may have believed all that when we were boys, but we're grown men now. We know it's all nonsense.

- Do we?

- Yes.

- You've forgotten - I have not forgotten.

[...]