How does Simon feel when he makes the discover about the ape-like beast?

When Simon discovers the ape-like beast on the mountain, he experiences a mix of terror and clarity. Initially, he is frightened by the realization that the creature is not a physical beast but a manifestation of the boys' inner savagery. This revelation leads him to understand the true nature of their fear and violence, highlighting the darkness within humanity itself. Ultimately, Simon feels a profound sense of isolation as he grApples with the truth that others cannot comprehend.