She will suck his blood when he is in the half vampire state. Then we have 3 options:
1 - Nazuna turns human by sucking a "vampire" and Kou loses his half vampire state;
2 - Nazuna turns human by sucking a "vampire" and Kou turns into a full vampire;
3 - Nazuna stays a vampire and Kou turns...
Mori and Studio Gaga really drew the short end of the stick. They will never be Miura. If the end of Berserk is bad (and it could be the end Miura envisioned), there is people who will shit on them. If the art gets bad, there is people who will shit on them. But these same people would shit on...
Hilde will sacrifice herself to save Thorfinn, because she will be guilty of trying to use violence when she "imposed" a no violence rule on others.
With this, Thorfinn will give up on Vinland, feeling conflicted about his position of peace at every cost