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At first, Jocasta doesn't see the link. Shereveals that an oracle once came to Laius and told him that he would be killed by his son, though she too reiterates that Laius “was killed by foreign highway robbers / at a place where three roads meet” (715-6). She tells Oedipus that, three days after his birth, Laius pierced the ankles of the child and had him cast forth “upon a pathless hillside” (720). This news worries Oedipus, for some reason. He asks exactly where the crossroads was that Laius was killed – Jocasta tells him, and describes Laius. “I think I have / called curses on myself in ignorance”, says Oedipus (744-5), fearing he has killed his father.
After this, Jocasta begs Oedipus not to “hunt this out”, despite the “clues” Oedipus has suddenly uncovered. She is frightened, and it is clear that she has realized what has happened, and she exits.