User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170413122356/@comment-31137559-20170413130434

Well he knows how the retiring system works. He knows how the Phenex's regeneration and the Phenex Tears work. He knows how Issei's Boost and Penetrate work and Issei had just unlocked Penetrate recently. I would say after all his Rating Games, he would know how the Evil Pieces work.