Mio has been captured by Zolgia following Maria's betrayal. Basara too is captured by Lars and brought to Zolgia's mansion. Lars' goal is to exchange Basara for Mio. He explains that he's only doing his duty as Mio's observer, but negotiations fail, and Zest slays him.
Then it's dangerous to leave her alive.
Dann ist es gefährlich,
sie am Leben zu lassen.
En ese caso, su vida 
representa una amenaza.
Alors il serait dangereux
de la laisser vivre.
Allora è pericoloso lasciarla in vita.
Então é perigoso deixá-la viva.
Тогда оставлять её в живых опасно.