Montressor has been injured and insulted by Fortunato and Montressor vows for revenge.
Montressor encounters Fortunato at the carnival. Fortunato is a wine expert , he is sick drunk and dressed as a fool. Montressor tells Fortunato about the Amantillado he has and manipulates Fortunato by using " Luchressi to test the wine."
The niche in the catacombs is making Fortunato's cold worse and Montressor keeps giving Fortunato more wine.