Westley's a Dick
Westley's a Dick
[A girl (Buttercup) with long hair and a man (Westley) looking like Cueball but with a bandana lies at the foot of a high cliff. There is a forest in the background] Buttercup: Oh, my sweet Westley!
[Buttercup sits on her knees, Westley takes off his bandana.] Buttercup: Why did you let me think you were dead? Westley: You shacked up with the prince! Buttercup: After years of mourning! The worst pain of my life!
[Buttercup stands up looking down on Westley who still sits with the bandana in his hand.] Buttercup: And now you ... kill people? Westley: I'd hardly be a dread pirate if I didn't. Buttercup: How lovable.
[Westley stands with the bandana in hand while Buttercup walks away from him.]
Westley: It was for the sake of the narrative! Buttercup: Fuck the narrative. I'm going to go see if that Spaniard's single. Westley: ...As you wish.

This is an alternate take on the 1973 fantasy romance novel The Princess Bride written by William Goldman which became a film in 1987 .
In the movie the main character, Buttercup, believes she has lost her first love to the Dread Pirate Roberts years ago. In the present she is considered one of the most beautiful women of the land and so is being married off to a prince. To provoke a war she has been kidnapped by mercenaries, one of whom is a very honorable Spanish swordsman named Inigo Montoya. A man claiming to be the Dread Pirate Roberts rescues her. On verifying his identity as Roberts, she attacks him by pushing him down a hill. While tumbling down the hill he shouts back "as you wish" identifying him as her first love. She tumbles after, landing on top of him as in the start of this comic.
There are, however, several "dick moves" Westley must have made in order for the film's narrative to make sense.
Westley breaks the fourth wall and claims he did all of these things for the sake of the narrative . In other words, he did it to make the story better. 
In the comic Buttercup realizes that Westley has behaved like a dick and chooses to give her love to Inigo Montoya. But in the movie, he and Buttercup end up together in spite of this behavior!
The title text shows what looks like a message she and Inigo have written together, for instance in a heart on a tree. Inigo is the Spaniard referred to by Buttercup. Their names, then forever (4eva) and a heart (smiley heart = "<3"), implying they did end up together according to this version of the story.  Alternatively, it could simply be the narrator expressing his wish that this will come to pass.
It is not the first time Randall has referenced this movie, as the Dread Pirate was referenced in 345: 1337: Part 5 , and a quote from this movie is in the title text of 1427: iOS Keyboard . So it seems like a film that has some meaning for Randall.
Note: It's quite possible Westley hasn't been killing people as a pirate at all.  People had been surrendering to The Dread Pirate Roberts without a fight for years before he took over the role, due to the terror of his name. Of course, there may be a few people who needed to be killed, over the years, but the implication in the book (and movie) is that at least most surrender without a fight and are presumably unharmed.
If you haven't seen the movie or read the book, you may find it helpful to read the synopsis of the book here .
[A girl (Buttercup) with long hair and a man (Westley) looking like Cueball but with a bandana lies at the foot of a high cliff. There is a forest in the background] Buttercup: Oh, my sweet Westley!
[Buttercup sits on her knees, Westley takes off his bandana.] Buttercup: Why did you let me think you were dead? Westley: You shacked up with the prince! Buttercup: After years of mourning! The worst pain of my life!
[Buttercup stands up looking down on Westley who still sits with the bandana in his hand.] Buttercup: And now you ... kill people? Westley: I'd hardly be a dread pirate if I didn't. Buttercup: How lovable.
[Westley stands with the bandana in hand while Buttercup walks away from him.]
Westley: It was for the sake of the narrative! Buttercup: Fuck the narrative. I'm going to go see if that Spaniard's single. Westley: ...As you wish.
