The three murderous blows that Clytaemestra strikes allude to the three libations offered during a normal sacrifice. Typically, one would offer three libations of wine: first to the Olympians, then to the Chthonians, and finally to Zeus, the Savior (Lebek 1-7). Clytaemestra corrupts the ritual sacrifice on several accounts. She offers blood rather than wine, sacrifices a king rather than an animal, and confuses the steps of the sacrificial ritual.
The first corruption of the ritual is the offering of blood rather than wine. It is not the first time that human remains have been offered for ritual feast instead of animal ones; the audience quickly remembers the feast of Atreus, perhaps the ultimate symbol of the impiety of the Atreides. By offering Agamemnon's blood as wine, Clytaemestra makes a connection with the feast a generation earlier. The second corruption concerns what is being sacrificed. Rather than killing some goat or bull, Clytaemestra murders her husband and king. Again, a person takes the place of an animal, and again, the audience is reminded of an earlier sacrifice. Here we are ironically drawn back in time. Iphigenia, with her saffron robes flowing around her, most likely begged her father for her life. The image is strikingly similar to what we, the audience, would see: Agamemnon lying dead, his crimson robes flowing around him, with Clytaemestra standing coldly triumphant over him. Finally, she does not offer her sacrifice to Zeus the Savior, but rather Zeus, who guards dead souls. In doing so, she has corrupted the ritual sacrifice on all levels. She has perverted the libation, the sacrificial victim, and the object of the sacrifice. She has inverted the nature of the gods, as well as man, revealing her true nature.
Aeschylus also intentionally confuses certain basic spheres of words. Clytaemestra groups liquids and cloths by association, confusing one for the other.