O1 starts the drill by passing to X1. O1 will skate up and take X1's spot. X1 will pass to X2 and take their spot. X2 will pass to X3 and take their spot. X3 will pass to X4 and take their spot. X4 ends with a one time shot. As soon as O1 gets to X1's old spot the next person in line passes. Everyone follows their pass.