User blog comment:B214/High School DxD BorN Episode 10 Review/@comment-223.176.232.209-20150608134121/@comment-26209278-20150608153138

They haven't moved the Raynare trauma from vol.10 into this season, they're just incorporating it more into the series, since the LN pretty much forgets about it after vol.1 and picked it back up in vol.10. This way, they're making it a more important feature and letting it flow better if the next season happens, which it has no reason not to.

And the PV where Sairaorg was punching Issei was more of a excitement booster instead of actual plot information. They were just pointing out Sairaorg appears in this season, not that they have an actual fight like it suggests.

Loki sealed himself so that the Asgard gods couldn't extract the information about Rias' whereabouts from him, trying to guarentee Ragnorak happens.