Reason #s02e12 why NBC Hannibal is a masterpiece
The show has, already, multiple times diverged from the plot of the books, often times drastically improving it. This is another example.
Originally, Lecter has therapy sessions with Mason, long before he is suspected of cannibalism. Mason then invites him to his house and shows him some vulgar and unsightly things, all the while acting like a pretentious prick. Lecter then gives him a drug and convinces him to feed his face to his two starving dogs, and to eat some himself. Afterwards, he breaks Mason’s neck, but fails to finish the job, instead leaving Mason paralyzed. Mason wants to feed Lecter to his swine BECAUSE of this interference.
It is difficult to see any strong motivation Lecter has, as it is not explicitly stated.
However, in the show Lecter has two fantastic motives: to prevent himself to being fed to pigs again and to check Will, by first having Mason feed his face to Will’s dogs, then “killing” Mason in front of him.
The first reason comes from the logical flow of the new story, it is relatively self-evident.
The second is the utilization of the situation as a tool to probe Will, to confirm on whose side he is on: Crawford’s or Lecter’s. When Will shys away from relieving Mason of his suffering and killing him (he was earlier scolded by Crawford for the murder and dismemberment of Randall Tier), Lecter sees that Will is becoming intimately close with him to turn him in, put him behind bars, and not because he has “realized himself”.
This becomes evident in the final scene of the episode where Will walks into Lecter’s office while the latter is drawing the scene of Achilles lamenting Patroclus, his dear friend (...love...). From the dialogue, we can see that there is a parallel between Lecter and Achilles, and Will and Patroclus (I can rant for an entire post about this, but I will stop this analogy here). This serves as a veiled signal to Will that Lecter laments losing him, Lecter trusted Will, and Will betrayed that trust in his eyes. Lecter knows that Will is working against him, as he is saddened by this.
It must be noted that although Lecter makes a few jokes about the meat of “Freddie Lounds” being bitter because she was scared when she died, he does not actually taste it, but rather the taste is a product of his deductions based on Will’s flawless acting. Lecter does not yet know of Will’s betrayal, so when he starts to suspect it he needs a testing method, hence, the use of Mason Verger.
Instead of wasting the potential of Mason destroying his face at Lecter’s command as the book did (still very salty about it), the show utilizes it to drastically develop the storyline, and further complicate Will and Lecter’s relationship.