Jodorowsky's Dune Uncovered
Scene 100 : Hawatt's Choice
Rabban brings the captured Kynes and Farok to the Baron, who is using Feyd's stomach as a pillow, but Rabban has to admit that he hasn't seen the bodies of Paul and Jessica, even though he is sure they died in the storm.
The Baron decides to take Farok back to Giedi One as a gladiator, and arrange for an "accident" for Kynes.
Hawatt is brought in, and the Baron offers him a poison, which Hawatt drinks as he wants to die.
The Baron then lies to Hawatt, telling him that Jessica betrayed both the Atreides and the Harkonnen, and asks Hawatt to be the Harkonnen Mentat to enable them both to take revenge on her.
Hawatt agrees and the Baron gives him an antidote, which he must receive every day in order to live.
Well, at least Hawatt doesn't need to milk a cat every day!
There is an image of a Moebius storyboard that despite being of low quality does show the Baron laying on the stomach of Feyd, and from the scene number would place it in the correct place. Perhaps it shows Hawatt's fateful decision?