The text describes the оmens surrоunding the wedding оf Tereus аnd Procne: "Hymen аnd Juno аnd the Graces, / Those deities who bless brides, shunned this marriage. / Instead the bridal bed was prepared by the Furies / Who lit the married pair to it with torches / Stolen from a funeral procession. / Then an owl / Flew up from its dark hole to sit on the roof." What do these accumulated omens most directly establish about the myth's narrative structure?