"The Raft" creature = an extraterrestrial organism? (UFO can be seen?)
At the end of the story, when the last girl is being killed and the guy looks back at the car, you can see something in the sky, something white that's moving at a constant speed. Doesn't resemble a cloud, though, and the rest of the sky is clear. In the bottom-left corner of the "object," it looks like it's reflecting sunlight, as if it's metallic. Perhaps a UFO? Maybe the "blob" is an extraterrestrial organism?
https://www.youtube.com/watch?v=ns0Rv6Iv3r0
Go to 19:55.
It's worth discussing, IMO.