To be exact, it wasn't about the shadow guard, but something similar. Zein told the summoner about what Senan asked of him last night; something that he kept thinking about the whole day.
"The Iron Shield, huh…" Radia rubbed his lips. "They asked to be your brigade?"
"I don't even know what a brigade means, what they are for," Zein shook his head. But he remembered the envious gaze Senan had at his bodyguard, as well as their pledge to follow and protect him. "When the old man told me about it, all I could think about was the shadow guards you put on me."