"So," you say, looking up at Isshin, "I suppose the first thing I should do is apologize, in case I revealed anything that was supposed to be kept secret. It's not really any of my business. I just hope that you understand that I did so because I was concerned that it might have been done without your knowledge or approval."
"You're right," Isshin agrees with a stern look. "It isn't your business." Then his face softens in a slight smile. "But your concern is appreciated."
"And since I don't consider myself that close to your family, I won't pry about the reasons behind the bindings on yourself and your son."
"I appreciate that. We're going to be answering enough questions once Ichigo's had a little time to let it all sink in."
"That said," you continue, "you clearly were aware of those bindings, and yet you, your wife, and the sapient cat were all surprised when I mentioned magic. Why is that?"
"Well, I can't speak entirely for my wife or the cat," Isshin says, "but for myself, it's mainly because magic isn't something I've ever had to deal with in any serious capacity. I was pretty heavily involved in spiritual matters when I was younger - it's traditional for the family I was born into. I ran into a few practitioners in those days, usually inexperienced spirit-callers who got in touch with something more than they bargained for, or the occasional sorcerer stockpiling souls for whatever reason - and every once in a while, a demon. It was uncommon, though, and I gave up that job when I met Masaki. I haven't seen a hint of magic since then, and as far as I know, my wife never encountered it at all before we came to this tournament." He shakes his head, grinning faintly. "Hell of a way to introduce her to the subject."
"I'm not sure there's any really good way to do that," you admit. "I told two of my friends at my last birthday party. They had some minor mental meltdowns when I started casting spells, but they've dealt with it pretty well." You consider what Isshin has said. "I take that means you don't know anyone who could be responsible for what's been done to Tatsuki?"
"As far as I know, there aren't any magic-users living in Karakura," Isshin says plainly. "Not of the level you were describing, anyway." He frowns. "Speaking of, how is it that an eight-year-old boy knows as much about magic as you do, in addition to everything else you've done or hinted at? Being naturally gifted or hardworking is one thing, being both is another, and then there's whatever you are."