It’s so fascinating that the only time Will empathizes with a victim–instead of the killer–is with Randall. It’s still the case that he’s focused on the killer i.e. Randall is introduced into his life as such, however, the contents of the conversation is important because it’s essentially Will talking with himself by proxy through his perception of Randall. This has also never happened before. Will is now locked in–he has to center himself against Hannibal’s manipulations to succeed in catching him. This is a trial and so it makes so much sense that he has this little moment of introspection: Randall tells him “This is my becoming, and yours” and Will shakes his head, he says, “This is my design” I think as an exertion of control over the situation. This is him saying, “This is my trap, this is how I catch Hannibal, this is MY design, I’m in control.”