It certainly does make him wonder. It's not a subject he can easily find emotional investment in; he certainly doesn't agree with the practice of slavery, but it had been banned nearly three hundred years ago, in Japan. It wasn't something he'd ever had much cause to think about.

"You speak as one with personal experience." He's not making any assumptions about what may have happened or how she encountered it, but the level of passion is certainly too intense for him to think otherwise.