They have to make some other tie in to push Bill to Jacksonville, since the show never made Bill part of the Vamp hierarchy [yet], and he isn't doing Vamp research to get him into trouble.
I kind of figured they would push Bill to Jacksonville by putting Lorena in trouble... this would force him to go save his maker even though he doesn't have any more allegiance to her. Only reason why I don't think it's Eric is because there is no need for him to use silver... but then he was wearing gloves to protect himself... so it could be him (think the gloves are to just throw ppl off). Regardless, I don't see how Eric could force bill into the Jacksonville situations, since it is Eric who helps Sookie get there in the first place in the books (why would he help her if he is the root cause of it anyways?). I know they can obviously turn it around, but I don't see how they are going to further the love triangle between the 3 if they make Eric out to be pure evil.