My bad. I completely forgot about the whole season with the witch lady.
Anyways it was the end of season 3.
Bill and Eric bury Russell alive in cement, then Bill turns the tables on Eric and tries to kill him by doing the same thing. Eric escapes and tells Sookie that Bill was originally sent to Bon Temps to procure her for Sophie-Anne and that he purposely allowed the Rattrays to beat her nearly to death so that he would be able to feed her his blood.
Got that off wiki episode guide. Anyways season 4 is when Eric was smashing sookie off. So in here its saying how when Eric and bill killed that one vampire league broad. It was for sookie. So I guess they bonded cause they on the run together.
Nan Flanagan tells Eric and Bill that she has been fired as spokesperson of the AVL and wants to start a mutiny against the Authority. She also tells them she knows that Sookie is part fairy. Bill deals her the True Death and Eric kills her guards to protect Sookie's secret.