{{explanation}}
3s & 4s start on opp sides

1-8
: 1s & 4s turn RH & cast in 1 place, dance LH across 1/2 way & 1/2 turn
  corners RH
9-16
: 2s+4s & 1s+3s dance reels of 4 across dance. End 2 4(1)(3)
17-24
: 4s & 1s cross to face partners corners on the diag & set, 1/2 turn
  corners RH, 2s+3s join LH to form St Andrew's cross & all Bal-in-Line
25-32
: 2s & 3s 1/2 turn corners RH with 1s & 4s turning to face partners (in
  middle) & all set, 4s & 1s lead out of ends, cross & cast to 2nd/3rd
  places