I think Carcharoth's fate was wound inextricably with the Silmaril, yet so was Huan the hound's doom. Carcharoth was bred by Morgoth to be Huan's bane; therefore, the passage referring to Carcaroth's fate has the further inference of meeting Huan at last in mortal combat. Breaking the Girdle of Melian was due to the Silmaril, and Carcharoth's fate was to meet Huan in Doriath.
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And your little sister's immaculate virginity wings away on the bony shoulders of a young horse named George who stole surreptitiously into her geography revision.
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