Playing charades, Tara mimes something with her head and pain; Gabrielle guesses (correctly) the birth of Athena. The myth goes Zeus had a conflicted relationship with the Titan Metis. He had sex with her but fearing her future children swallowed Metis whole. Much later Zeus had such a terrible headache he ordered someone to open his skull with an axe. Out popped Athena, not only grown to adulthood but fully clad and armed for battle.