User blog comment:IamJakuhoRaikoben/Chapter 371: Tartarus Arc: Part 2 - Song of the Heavenly Dragon, Review./@comment-4933386-20140215012026/@comment-7418318-20140215084510

That's what I was thinking too, only I think his real purpose in the dungeon was to drop the sword and the cloak was for keeping it out of sight, maybe doubling as an excuse for his visit to the prisoners.

Either way he only tossed it to Lisanna once he no longer needed it to hide the sword.