When Fezzik and Inigo face Yellin, the only man left in front of the castle, he yields to them the gate key after being threatened with the possibility of having his arms torn off. From this point forward, we launch into a detailed countdown toward the wedding. At 5:30, Fezzik, Inigo and Westley enter the castle. They are instantly confronted by Count Rugen.
Meanwhile, the wedding is progressing slowly due to the old Archdean's pontifications on marriage. Humperdinck hurries him up, and at 5:31 he and Buttercup are wed.
At 5:34 Inigo makes his long-rehearsed speech to Rugen: "Hello, my name is Inigo Montoya. You killed my father. Prepare to die." Rugen turns and flees.
At 5:46 Buttercup is left along in the prince's chamber, and she walks toward his wall of weaponry in search of a proper tool for suicide.
Inigo follows Rugen, at 5:37 needing Fezzik's assistance, but this requires leaving Westley alone. Inigo follows Rugen through the coridors.
At 5:48, Buttercup is halted in her suicide attempt by realizing that her Westley was lying on the bed next to her, and she is overjoyed.