Question: It's now clear why Angus is found in the circle of stones, even though he was afraid to enter it in the first place. There's one part of that matter I don't quite understand, though. Why is he afraid to enter that circle in the first place? Is there something in that circle frightening him? Is there a special effect?
Question: In the openings scene, the prehuman drinks a tar-like fluid (like the one poisoning Halloway later on), while looking at a spaceship hovering above. He then dies, falls into the river and disintegrates. I do not understand this scene, is he the last of the surviving prehumans committing suicide and the ship above is the others leaving the planet?