"Ohhhh," he lets out, at the mention of memories. And by that face, it probably wasn't the greatest time... Had it been for anyone?

"So, you're like her guardian now, huh?" He says it positively, a position they can relate to. "Like I was. What, has she got some important thing going on?"

He remembers that Mami can use magic--and then a second later, that B assigned roles to people who could use magic. Was that it?