Another Canon Divergence AU idea for "The Princess Bride" is that Westley ISN'T following Buttercup when she gets kidnapped. If he's not doing that, presumably intending on kidnapping and confronting her himself, then he really has no way of finding out about the kidnapping besides, again, spying on Humperdinck and Rugen (which is very difficult to do). And if he's not there to follow the kidnappers almost immediately, then he has no way to intervene in time.
So, Westley has been through a LOT of unpleasant shit to get back and has just found out that his true love has moved on to become engaged to their local prince. He's confused. He's really pissed off. He misses whatever opportunity allowed him to follow Buttercup on her daily ride (didn't see her ride out, didn't hear about it, whatever), because he's following another opportunity into the castle to investigate Humperdinck. Or else he sees Humperdinck and Rugen riding off towards the Pit of Despair together and decides to follow them instead. Either way, Westley overhears the two men very casually discussing Humperdinck's beautiful but forcibly gained fiancée and the kidnapping plot currently underway, and Westley realizes that Buttercup is about to DIE and he's very likely not going to be able to reach his true love in time. He still runs off, desperate and ready to die trying to save her.
And Westley is really much to late to cross the water and climb the Cliffs of Insanity and all that, because Buttercup and her kidnappers are already at the border with Guilder. It's fine though, because when Fezzik and Inigo are confronted with the murder part of the job, they object, and Fezzik ultimately decides that he's really not cool with it. Fezzik thumps Vizzini over the head while Vizzini is berating Inigo. Fezzik apologizes to Buttercup. Inigo looks at the unconscious (possibly dead, heavily concussed at least) Vizzini, shrugs, and then helps Fezzik untie Buttercup and apologizes as well.
It's more than a little awkward, because none of them really know what to do besides wander vaguely back towards Florin. Buttercup admits that she doesn't really want to marry the prince, and he'll find her if she goes back to the farm, which leads into her telling the story of her dead true love, which Inigo and Fezzik find very romantic. Which leads into Fezzik and Inigo both sharing their own tragic backstories in turn. Buttercup is personally very intrigued by Inigo's mention of being in the revenge business.
And then Buttercup goes, "Wait a moment, I know a nobleman like that. Count Rugen is Prince Humperdinck's closest friend and confidant, and he has six fingers on his right hand. I once had to sit next to them at a dinner table while they spent over an hour discussing all the troubles of finding a good glovemaker and skincare for their hands." (Rugen and his wife also once visited Buttercup and Westley's farm when they were younger, but Buttercup would more recently know Rugen from just... around the castle. Rugen is presumably going to be Humperdinck's best man.)
So, Westley is like, "Where the HELL is the love of my life???" presumably harrassing Vizzini about it if Vizzini is still alive. And Humperdinck has his theatric rescue party together to find Buttercup's body on the border, unknowingly following behind a rushing and frantic Westley, trying to keep his lies straight while he's internally like, "What the HELL happened to my kidnapping and murder plot to incite a war??? Rugen, I thought you hired the best??? It's so hard to find good help these days!"
Meanwhile, Buttercup, Fezzik, and Inigo are on a new friendship quest back to Count Rugen's house. Buttercup is the future princess, and so is presumably already acquainted with Rugen's young and beautiful wife, who has to let her in and be a good hostess. The Countess is warily like, "Buttercup... Who are these unkempt and intimidating men...?"
And Buttercup says, "Oh, they saved me from being kidnapped and killed! 😄 I'm sure that my fiancé will want to thank and reward them in person! 😄 This was the closest safe place I could think of! Thank you so much for your hospitality. By the way, when do you think your husband might be home? 😄"
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