User blog comment:B214/Question and Answers 2/@comment-4547267-20140319005102/@comment-187.209.2.161-20140319023326

I think that "That event" is related with the dream of Issei to become a High class devil and get his own team, I said it because currently issei is worried because he will leave rias team(mybe with Asia and Xenovia), maybe in the moment issei decide stop proclaim be "Rias Gremory Pawn" and using the union Master-Servant, instead now he will talk abaout a "Union" of marriage, because now he will be also a High class devil as Rias.