Not ep 7, but if you haven't watched it yet don't read it just to be safe.
I remember reading the director of Breaking Bad wanted a story where the protagonist turned into the antogonisthttp://en.wikipedia.org/wiki/Breaking_Bad#Conception
"Gilligan wanted to create a series in which the protagonist became the antagonist. "Television is historically good at keeping its characters in a self-imposed stasis so that shows can go on for years or even decades," he said. "When I realized this, the logical next step was to think, how can I do a show in which the fundamental drive is toward change?" He added that his goal with Walter White is to turn him from Mr. Chips into Scarface. He has said it is difficult to write for Walter White because the character is so dark and morally questionable: "I'm going to miss the show when it's over, but on some level, it'll be a relief to not have Walt in my head anymore." As the series has progressed, Gilligan and the writing staff of Breaking Bad have made Walter more and more unsympathetic. Gilligan said: "He's going from being a protagonist to an antagonist. We want to make people question who they're pulling for, and why." Cranston said by the fourth season: "I think Walt's figured out it's better to be a pursuer than the pursued. He's well on his way to badass." Gilligan defines the term "breaking bad" as "to raise hell"