A: Ones lead down through twos (skip), cast up to place. Twos lead up through ones, cast to place.
B1: First corners cross; second corners cross. Fall back a double with neighbour; come forward turning single away from neighbour ¾.
B2: Neighbour back-to-back. Starting with neighbour, dance three changes with hands.
This is Colin Hume's interpretation. See notes at https://colinhume.com/instr.ht