Beats 1-2: first corners (dancers #1 and #4) cross by the right shoulder.
Beats 3-4: second corners (dancers #2 and #3) cross by the right shoulder.
Beats 5-6: first corners return (backwards), passing by the left shoulder.
Beats 7-8: second corners return (backwards), passing by the left shoulder.
Beats 9-10: first corners (dancers #1 and #4) cross by the left shoulder.
Beats 11-12: second corners (dancers #2 and #3) cross by the left shoulder.
Beats 13-14: first corners return (backwards), passing by the right shoulder.
Beats 15-16: second corners return (backwards), passing by the right shoulder.