You weren't there when he died, was my my point. As well, Pass had actually offered. That negates the idea that you'll be blamed--we know what it's for, it's all out in the open. And for someone who doesn't like being framed, you're certainly being successfully framed right now. While Rosenkreuz could have, the far simpler explanation is also that someone with pre-existing knowledge did it--especially if he did indeed have the knives on hand, it makes little sense to electrocute someone, too, when he could stab them to death. And while you didn't know, if there is, indeed, someone working against us, then there's little reason to think they couldn't have known.