The Princess Bride: What can we learn from The Duel of Wits?

Greetings,

When most people think of "The Princess Bride" (1987), they think of the duel on the cliffs, especially if you are of the "swordy" nature; in the same vein they think of "My name is Inigo Montoya. You killed my father, prepare to die." the relentless revenge of a boy trying to avenge the death of his father. They think of the reputation of the Dread Pirate Roberts, or of true love and how it will never separate Buttercup and Westley. 

<SPOILER WARNING> (for anyone silly enough not to have watched this movie which has so many lessons hidden within it)

There is another scene I would like to discuss a scene that happens after the duel on the cliffs; it happens after Westley (currently the Man in Black) wrestles with Fezzik and brings the mountain of a man down. It is the meeting of Vizzini and the Man in Black the duel of wits. 

Vizzini holds the Princess with a knife to her throat, there is a little banter between the two of them, and then the following is said:

Vizzini: I can't compete with you physically, and you're no match for my brains.

Man in Black: You're that smart?

Vizzini: Let me put it this way. Have you ever heard of Plato, Aristotle, Socrates?

Man in Black: Yes.

Vizzini: Morons. (Source)

They then decide to have a "duel of wits," between them. Two cups of wine are poured. The Man in Black produces a container of poison, which he has Vizzini smell, it is odourless, tasteless and dissolves instantly in water "iocane poison" it is named. It will be placed in one of the cups, they will drink and find out "which one is right, and which one is dead." The Man in Black takes the cups and places the poison then places them back on the rock. Vizzini then uses logic to figure out which cup has the poison. He distracts the Man in Black and switches the cups. They both drink, and after a little gloating about how he switched glasses, Vizzini falls dead. Both cups were poisoned. The Man in Black had spent time developing a resistance to "iocane poison."

The first question: Could Vizzini have survived the encounter with the Man in Black? 

An argument could be made that as the poison is odourless and tasteless, Vizzini ingested the poison as soon as the Man in black offered it to him to smell, particles of the poison could have been ingested at this early stage and Vizzini was a dead man already. This is more a "Kennedy assassination/magic bullet" sort of approach to the situation. So, we will leave this one alone and focus on the duel of wits.

If a person follows Vizzini's logic through his argument, it is a rambling statement of facts and theories, where he starts with some sound theories, but ends up going completely off-track. The same process could have been used. In the movie, Vizzini was going to die, it was a plot point that was required, so the Man in Black could plan for the castle assault in the final part of the story. Even if the wine had been spilt, thus Vizzini not choosing either cup, duel would have started again, just with a different game. In the end Vizzini was going to die.

Next question: What can we learn from the duel of wits?

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