I put my vote on christoph

^ was thinking that and dreading it. christoph was the one who made the drink or at least helped kyon make it, and the fact s2 opens with christoph *experiencing a strange ringing in his ears* kinda points to him being suspicious.

thing is, christoph's been there for ages yet cecilia, who just arrived, had to be involved. i wonder if she's pinning blame on him just possibly, though the drink would be hard to explain.

It's either Christopher or logan but if it's Christopher why didn't he run away!