It's this moment of nonviolence Draco just like doesn't have it in him to be a murderer and that act of mercy, I feel like it's similar to the funeral in this way, right?
She says, to put it crudely, they refused to murder, not so much because they still held fast to the command, thou shalt not kill, but because they were unwilling to live together with the murderer themselves.
Not that I think it's like Fate Stay Night where you have like this, you know, bumbling idiot kid who ends up getting stuck with, you know, Saber and then he's constantly saying people die when they kill.