User blog comment:IamJakuhoRaikoben/Chapter 371: Tartarus Arc: Part 2 - Song of the Heavenly Dragon, Review./@comment-70.233.129.87-20140215021447/@comment-7418318-20140215083949

I blame it on Silver.

I think he used that cloak he later gave to Lisanna to hide the sword and after he "conveniently" dropped the sword nearby, he tossed the cloak to Lis since he no longer needed it.