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.
That's quite the convenient interpretation.
Welch bequeme Interpretation.
Qué interpretación más conveniente.
Voilà une interprétation
bien commode.
Sembra l'interpretazione più conveniente.
Essa é uma interpretação
 bastante conveniente.
Довольно удобное толкование.