Well I can't watch any more of these.
It's like watching a sickness unfold to see a man this mentally twisted up. He MUST take apart the book, line by line, he's obsessed with every line of it, but he's not even thinking, just spouting old fictional Scientology propaganda lines that are easily disproven, that he himself has disproven , not to mention countless other exes and actual documentation that disproves him.
Barf.
His face is bland and blank. No animation beyond the occasional look up, like a beaten dog hoping he'd served his master well and now half-wags his tail, "That was good, though, wasn't it, master? Wasn't it?"

Only to get some silent internal half-acknowledgement, "Keep going..." as he returns to his propaganda lines in this dogged task to which he committed himself. Line by line by line by line, through the book he tediously reads and spouts any vague disagreement he can. MUST... FINISH ... BOOK!
Whether the evil master is just in his head or not, we can't quite see. But it is real to Marty, so he continues.

So this is the great, "Rue the day?" Marty threatened?

He started on this course at least 1-1/2 years ago.
And Alanzo figured out he was used as a tool in some bizarre, insane caper, just to be discarded when he no longer served.
Folks want to make some sort of rational sense of this. Maybe somewhere in there, there's some sort of twisted logic. A payoff, blackmail, something.
But even if there is (and there probably is), this is how it was always going to go. Marty never could live without schemes within schemes within schemes. He always needed enemies to blame, even if it meant targetting his friends. I think he made a half-hearted effort for a bit, but he was never completely honest with himself, about himself. Common, accepted moral codes didn't apply to him. He was above that.
It's not exactly sad, unless he has a brain tumor. It is pathetic, though, seeing him try to snap right back to his full, amoral self and watching him, knowing he is quite aware that the pieces he recites don't fit. That doesn't stop him from trying to force it, though. Must get back to his old self.
Bye, Marty.

It was a good lesson in what happens to people who think they are above truth and integrity, if nothing else.