These remind me of the lighting treatment of 60s tv shows like "Outer Limits" or "Twilight Zone". Cast all kinds of strange shadows on faces to let the audience know that they're sinister.
For example, check out Evil Kirk two minutes into this video: https://youtu.be/KnUqGTNezME
See, he doesn't need to say anything. Just shine a weird light on his face and he becomes EEEEEVIIIIIL!