Bars 1-4: Dancers 1 & 8 cast outwards (#1 and the master side heading up, #8 and the apprentice side heading down), curve around 270º (3/4 of a circle) and across, clashing on the last beat of bar 4. (The set is now perpendicular to the music.)
Bars 5-16: Repeat this sequence 3 more times, ending up back in home positions.