Step 1

D1 marks O1 and starts the count. O2 starts deep and cuts in toward the space behind the disc as the count reaches the middle numbers.

Step 2

At stall five, O1 pivots and throws the dump back to O2, past D1's reach.

Step 3

O2 swings it straight away to O3, before D1 can get across.

Step 4

D1 runs over and sets a new mark on O3, on the same side as before.

Step 5

O2 drops back behind O3 to become the next dump, and O1 moves across into the swing spot.

Step 6

The triangle has turned round and the drill runs again: D1 counts, O3 dumps at stall five and O2 swings to O1.