User blog comment:Gary299/High School DxD BorN episode 4 review/@comment-26209278-20150425213806/@comment-26209278-20150425220822

From the look of it, the style of the fight is pretty much the final battle of the 7th volume (because of the Midgardsormr clone,and Hati&Skoll being there), but made to be similar to the first battle where Loki was first introduced, in volume 7. As you probably know, it's also designed to take over from the Sitri RG as well.