Should I place a bet? I'd say "no". Even though the guy who came too late is a vampire. My gut feeling says that Arthur is not.
Edit: Now I have a good pro-argument for my theory: Kane wanted to take Arthur's place, to do that, he needed to kill him. So he wouldn't have used a weapon that would render Arthur only temporarily "dead".
Yeah, Kane's intention was definitely not keeping Arthur alive D: but who knows, maybe things didn't go as expected... or maybe our heroes are indeed wrong and there's still an element missing? :D We'll find out soon! ^_^
author comments