User blog comment:B214/Question and Answers 3/@comment-25015596-20140729064722/@comment-3325617-20140729170555

@B214 I think he meant if Riser can borrow Issei for the rating game and then return him back after. @DownfallDragon No that's impoosible.You cant't borrow a piece no mater what.The only way for Issei to fight with Riser is if Riser exchanges pieces with Rias and then exchanges them back again