User blog comment:B214/Season 3 confirmed!!!!!!/@comment-24502975-20150114150539/@comment-1359322-20150114224156

Or probably like the Ise vs Sairaorg thing, it's not part of the main story. If you ask me after seeing the preview again, i'm more than convinced that the 1st PV is mainly on the opening only. Just looking at Rose's action in the PV screams OP scene.