Clotho spun the thread of life from her distaff onto her spindle.
Lachesis measured the thread of life allotted to each person with her measuring rod.
Atropos was the cutter of the thread of life. She chose the manner and timing of each person's death. When she cut the thread with "her abhorrèd shears", someone on Earth died.
We'll leave it for you to decide which fate is which.