User blog comment:B214/Question and Answers 6/@comment-26293136-20160922210136/@comment-29963364-20160922213432

After Fafnir faught Rizevim in Heaven, Fafnir has been unconcious, but he visited Asia in her dreams every night since then. I think that when Asia achieved Balance Breaker, it was a combination of her feelings and Fafnir using their connection to give her his power to protect Issei's parents.