Batman and Ra's al Ghul in “Showdown”

Batman

You left Duvall to his fate a century ago. Why come back for him now?

Did you really think, detective, that in my six hundred years of life, I would have sired only one offspring? Even before the Phoenix debacle, I had come to realize that Arkady was too unbalanced and cruel to wisely rule my empire.

Batman

But you couldn't forget about him.

What father can ever forget his son? Come now, detective, I've still a few good years left. We will cross swords another day. But for now, let me take my boy home.