User blog comment:B214/High School DxD BorN Episode 9 Review/@comment-205.217.176.6-20150601045412/@comment-26454875-20150601112644

Oh, it looks like you missed this... No problem. On Episode 5, when Issei was bitten by Fenrir, he was almost dead, however when Rias saw the gift from Ravel she used it on him. It turned out that the gift was Phoenix tears potion. When Issei gets on his feet, he gets Mjolnir and hits Loki with it, sending him away. However, right before dissapearing Loki cursed him.