A glimpse of the Hound fighting Lord Beric. The round shield (not right for the novels, for what that’s worth, but heater shields are pretty non-existent on the show) does seem to feature the show’s version of the Clegane arms.
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Season 3, Sandor Clegane, S3, Rory McCann, Richard Dormer, Game of Thrones, EP305 Index, EP305, Beric Dondarrion