No, you clearly don't know who you're talking to, so let me clue you in. I am not in danger, Skyler. I am the danger!
Although this speech is directed at Skyler, it is also for the benefit of the audience. Most people who watch the show root for Walter because despite some of the inexcusable things he does, we assume that he is doing it “for his family”. We are still operating under the assumption that deep down he is still the same guy that looked terrified to hold a gun in the pilot, and all of the killing and manipulating he did was done for the greater good: and that influenced how we perceived the first 3+ seasons.
This is the first concrete moment that we clearly see that Walt has ulterior motives influencing why exactly he chooses to cook meth. He was never planning to just pay off his bills and retire. Walt is obsessed with the power and respect that his reputation as “Heisenberg” brings him, and doesn’t show any signs of wanting to relinquish that power soon. Whether it was forcing Walt Jr. to drink tequila just to prove his dominance over Hank or telling the aspiring meth cooks to get out of his territory, Walt is still trying to compensate for how powerless he felt for the greater part of his life.
So, when Walter emphasizes that “he is the danger”, he wants everyone to know that there is no more “Mr. White”. He has fully embraced his role as the murderous drug lord Heisenberg, and expects us to do the same.
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