Spoilers for Game of Thrones season 8, episode 5.
In one of the more vomit-inducing scenes on Game of Thrones to date, viewers got what many fans have been dying to see: The head-to-head fight between the Clegane brothers, also known as Cleganebowl. The Mountain, a.k.a. Gregor Clegane, a.k.a. now a literally rotting zombie, faced off against his little brother, The Hound, a.k.a. Sandor Clegane, a.k.a. the guy with the burned off face. And it was a knock-down, drag-out fight that saw BOTH brothers perish as the Red Keep collapsed around them. So why was this so important? Why did both brothers die? Why was it the grossest ever? (That last one might just be me.)
First, some context. The Mountain, before he was a giant undead murderer, basically shoved The Hound's face into a fire and burned him terribly over basically nothing (The Hound was playing with one of The Mountain's toys when they were both boys). Ever since, The Hound has hated his brother juuuust a little more than he hates/is petrified by fire. This has been a recurring theme throughout the show, both with The Hound channeling some major PTSD every time he has to get near a blaze and his repeated insistence that he would get vengeance on his brother.
And in the episode, in case you hadn't seen it, really went for it: The two fought like it was the fight of their lives (it totally was). The Mountain took off his helmet and showed off some seriously festering flesh—we'd seen him in season 7 looking a bit more lifelike, but he's been rotting away since then. Now he's all white skin and black eyes (trying not to puke). The Hound stuck a sword in The Mountain; The Mountain shrugged and pulled it out. The Mountain attempted to to the same I'm-going-to-crush-your-eyes-and-then-also-your-face move he'd pulled on Oberyn Martell, then The Hound stuck a knife in his brain. The Mountain looked like he was debating it quietly for a second, then reached up to pull it out. And The Hound ran towards him and pushed them both off the tower to their fiery deaths.
In the "Behind the Episode," creators D.B. Weiss and David Benioff explained that they knew The Hound would die by fire—symbolically very ironic, since he hates it so much—and also reiterated that The Hound's hatred of his fire was ever so slightly outweighed by his hatred for his brother. So, in other words, The Hound realized that he would have to burn to death in order to kill his brother. So, he chose the slightly lesser of two evils. I would also argue that, since the brothers also fell from quite a height, that they might have only burned for a short while before hitting the bottom of the Red Keep.
During the episode, The Hound also realized his quest for vengeance would be a one-way trip, as he explained to Arya. He knew on some level this would be the end of him as well. At least based on what I've read, fans were initially hoping that one brother would prevail over the other. But in this case, I think the ending's slightly more poetic this way. Nothing was going to kill the seemingly unkillable Mountain except total destruction. And The Hound was willing to do what it took.
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