Nanami grits his teeth. He hates people like that. Children are not to be murdered. He kneels before Geto, leaving him a little room but right there. "That's unacceptable," Nanami says. "No decent sorcerer would let them do that."

He wouldn't have, if he were there. Geto is powerful enough he didn't need to kill the villagers to extract the girls. That part was... his decision.