Groups of 6 ideally - but you can include extras at stations (A & D) - require a line spanning one third of the court.
(A) performs a 1-2 pass with (B)
(A) continues with a second 1-2 pass with (C), then completes their turn with a pass to (D)
(B joins A), (A joins C), (C) stays-put. Remind everyone that moving player joins 2nd station they passed to.
(D) repeats back the other way, first 1-2 pass is with (C), second with (B), then passes to (A).
(C joins D), (D joins B), (B) stays-put.