Board Thread:BlazBlue: Centralfiction/@comment-8695373-20161004174202/@comment-8695373-20161004200857

But Terumi already was in the Unit, before Hakumen, and the only problem he had with it is that Susano'o is bound to Amaterasu.

Oh, right. Susano'o Unit is bound to Amaterasu Unit. So, not only Hakumen has to be killed for Susanoo character to happen, something also has to happen with Amaterasu.