Strophe 3
πρὶν Ὀλύμπιος . . . ἔνεικεν: The Schol. makes a full stop at αἰεί, and considers πρίν an adverb, with γάρ omitted =πρότερον γάρ. But πρίν requires a standard of reference and αἰεί forces a close combination. πρίν with the ind. always means “until,” which here marks the introduction of new blood.