Note especially ll. Cassandra serves to inform the audience and chorus what is happening off-stage. Cassandra's curse was that no one would ever believe, in spite of the fact that she always foretold accurately what was to happen. Here she is alluding to the return of Orestes, the subject of the following play, Libation Bearers. Exit Cassandra to her doom.
Full chorus sings again.
Ag. cries out. The chorus does not know what to do. Note the anti-tyrant sentiment of some of the chorus members. Recalls the memory of tyranny in Athens. The chorus criticize Cly's actions.