[Alucard ignores the blood and ash. Ignores everything about Trevor, about the bag. Why there's wax cloth. All of it isn't important.

Moreover, and this is the important part: he doesn't care.}

Fine.

[He doesn't like that doorway. Doesn't like that it means using Sypha's energy.]

The castle needs energy to endure until it exist on it's own. The buildings were fine, but the circumstances changed and it moved to Sypha as a host because of her strong will. But even that is limited, and that is why we are in the current situation now.

If a location in London can be found on or atop a leyline, then all will be well. In the mean time, I can take the castle from her.

[As almost an afterthought, he adds:] I'll have a week at most before that kills me. I'll find a coffin and rest for that week.

Saves you the trouble if all fails.