[X] Ask Riona to hear you out. No interruptions.
[X] Explain your work and hopes to improve things.
-[X] To set standards, justice, good living conditions, spreading cleansing, all of it.
-[X] Your work towards de-Witching, and hopes that she could help with it.
[X] Even if Riona's actions could be justified in some ways, from some point of view before now, now that we're here, they are not. Not anymore.
[X] Demand:
-[X] She stops taking Souls.
-[X] If possible, she restores the Souls she's taken, and if not, releases them.
[X] Every problem, doubt, dificulty she sees with this, she can forward it to us.
-[X] A magical girl turning other into witches? We'll catch and imprison her.
-[X] The bodies from the Souls she took have decomposed? We'll magic them new ones.
-[X] She can't restore the Souls she took? We'll get friends working on it.
-[X] Etcetera.
-[X] We'll take care of it. There's no need nor justification for taking people's souls.
[X] If she's not convinced we can do all this, give us a chance:
-[X] She'll stay where we can see her, and help us work on de-Withcing.
-[X] She'll agree to stop taking Souls.
-[X] She'll agree to restore/release the ones she's taken, once she sees we're making progress, that we're actually making things better.