After the second turn the dancing couple continues the reel with bottom couple to change places.
Note: on  the original says »RH«, but »BH« is widely used.
After 2nd turn the old 1c casts to 4pl on the new [1-2]
On [7-8] 1W+2M originally passed Lsh, but the deviser changed this to Rsh.
2c start on opposite side (1,2x,3)