The identical twin brothers are called Sam and Eric, or Samneric for short, not Simon and Eric. In chapter 6: Beast From air Samneric simultaneously describe the beast, and I quote.... "It was furry. There was something moving behind its head--wings. the beast moved too---" "that was awful. It kind of sat up---" "There were eyes---" "Teeth---" "Claws--" "The beast followed us---" "I saw it slinking behind the trees---"
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The signal fire went out when Jack made Samneric leave the fire duty to go hunting. It also goes out when Samneric "see the beast".
Yes, I have to agree with that about Samneric climbing the Mountain.
SamnEric
Why don't you read the book and find out? They go to Castle Rock which is the only place that Jack admits that he has never been to during his hunting expeditions. When no beast is found they then decide to look on the mountain top, which is where Samneric reported they had seen it.
When Simon discovers that 'the beast' which Samneric had seen on the mounatin top is simply the dead body of an airman he untangles the parachute lines which have caused the body to move like a puppet when the wind blows.