Pressed passes
A throws the ball to B, who immediately passes to C.
Then A and B change
place.
C passes to D who passes to A.
Then C and D change place.
Greater speed can be applied if the ball lane is between A and D all the
time.
A passes to D and immediately change place with B.
D passes to
B on A's position and D now change place with C.
Then the exercise starts
all over again.