They were trained to kill. It was just a part of the job. But away from the rest of the world, the guilt threatened to destroy them. How can you justify taking a life?
The times that hurt are thrown at random. You can't predict them and you can't get out of their way. All you can do is hope for it to end.
Years after the fall of Voldemort, she reflects on everything she lost, everything she gained and everything he stole.