Reminder that this fight is completely unecessary.
Vampires used to live peacefully with people on that island long ago, that just stopped being a thing because Miyabi is a lil' shit. Everyone on that church is aware of this fact.
Vamp Aniki has the vaccine that can make Miyabi killable.
Vamp Aniki could just hand over the vaccine and live peacefully as a vampire along with the more sane vampires.
All they gotta do is literally wipe Miyabi and his faction, everything else is completely fine.
There is literally 0 reason for this fight to the death, aside from big bro there INSISTING in making it a thing. Despite the fact that he has a child on the way.