Quinlin and alden being mad that Livvy didn't tell them not to break Prentice and that she didn't tell them the black swan was good is ridiculous like
"How could you not tell me?-How could you let me arrest him?"- Alden. Like really at your grown age of like 300+ years you needed someone to step in and tell you not to do something you were pretty dang set on doing likely outing themself as a member of the group you were persecuting in the process? Like you couldn't decide that breaking someone's mind and basically leaving them brain dead for the rest of their never ending life with little evidence of what you were looking for was bad? You didn't have the moral compass to figure that out all by yourself and it was the outside parties fault? REALLY?
And then quinlin saying "And you never told me the Black Swan were on our side!" "Even when I admitted to having reservations about performing the break." Like again what that actually means is why didint you tell me something that there would be no way to explain completely without outing yourself as a member of an order I and my bestie who i have a bond simular to marriage with are prosecuting? Livvy why didn't you tell me exactly what was happening and explain morality to me step by step instead of just trusting that I a grown man could follow the judgment I alredy had after you encouraged me to follow my own judgement?
Also relevant to this is that before Prentice was captured he was well respected and Alden and Quinlin likely alredy knew him from noble assignments and stuff but neither had emotional trouble capturing him in the beginning. So the same could apply to livvy.
Also this is how I imagine the conversation would go if she had tried that route:
