User blog comment:B214/Volume 23 discussion blog/@comment-1884090-20170408001538/@comment-31137559-20170411000806

Well before Volume 23 was released, how many people thought that they could use Irina being an Ace against them? After it happened, people would think it would be so obvious, but most people wouldn't have foresaw something like that, especially not Issei and his team who are mainly power-oriented. Now that Issei and his team can't come up with any good tactics or a good strategy, but their strategy basically revolves around power. Well Xenovia is mastering the abilities of Excalibur and Rossweisse's magic can be used for a variety of things, but their main focus is still power.