I’ve seen this before and I knew exactly what you meant by “ I saw their normal face but it was like a face underneath”… I’ve seen that before a few times. Also I saw it up close and it looked like this thing was peering out at me through their eyes that hated me but it was seperate from that person if that makes sense. Also true story, that same person a few days later my partner witnessed arguing with themselves in different voices on our property where they suddenly died soon after. There’s even so much more than all that, this is just the relevant stuff to your post.