Walt Absorbs Traits of Those He Kills
Walt racks up a fair amount of murders for a high school teacher during the course of the series and one can only imagine that would end up changing a person. In Walt’s case, he changed, but he actually ended up taking the traits of those he killed. The earliest example of this is the drug dealer Crazy Eight cutting the crust off of his sandwich. Later in the series, Walt begins to do the exact same thing.