Ancient Worlds: About Face, Forward March

My apologies, folks. This week is going to be more brief than usual. You may have heard that we had some excessively exciting weather last night here in Wisconsin. That means little sleep for anyone in my house and a shortage of brain power today.
Having decided for Jason and his men over her father, Medea provides him with a potion that will allow him to harness the fire-breathing bulls and sow the dragon’s teeth. These teeth spring up into an army, but Medea gives him the clue to toss a rock into their midst and they cut each other to pieces.
Jason is successful, but the fleece still isn’t in his hands. After a sleepless and frightened night, Medea realizes that A) there is no way her father is going to give it up and B) he probably knows that she is responsible for Jason’s feats. So she flees the palace, returns to the Argonauts, and promises to lull the serpent that guards the fleece. They can then make off with it, provided that they promise to take her with them.
Once their absence is noticed, the Colchians give chase. Medea’s brother Aspyrtus catches them in the Adriatic. Talks ensue and a bargain is reached: the Argonauts can keep the fleece, as they won it fair and square. The real point of contention is Medea. Since no deal can be reached, they both agree that she should be deposited in a temple of Artemis until a third party can judge whether she should be returned to her father or given to the Argonauts.
And here it gets trope-tastic, as Medea executes what is, in this work, a pretty inexplicable face-heel turn.