Our story begins with Mantresor explaining to the drunken Fortunato about a wine that needed to be tasted called Amontillado. Montresor preteneded to be concerned about Fortunato´s cough and said ge could have a better wine taster do the job. Fortunato assured him that his cough was nothing.
Montrasor an Fortunato begin to decend/journey into the catacombs to get to the Amatillado.
Montrasor did what he actually came to do and shackled Fortunato up to the wall and started building around him so he would perish. It took a moment but Fortunato realized what was going on. There was no Amontillado, just betrayal.
Soon after Fortunato´s emotional stages, he went silent. This meant that he was dead. Montresor realized that and started thinking to himself if killing him was the best way at revenge. I was too late, Fortunato was already dead and nothing could be done.