User blog comment:B214/Question and Answers 6/@comment-29255052-20180310044601/@comment-27083298-20180310045812

Hope you read the novels correctly.


 * Kuroka used her poison on Rias and Koneko, thus leaving them unable to fight.


 * Kuroka was overwhelming Issei before he achieved BxB.


 * Issei’s scale mail greatly enhanced his strength and defense, without it Issei would’ve been defeated.