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This scene ... is a bit mysterious. The actress appears to be Charlotte Hope, in a role named “Myranda”, but we really know nothing of it. She’s being undressed by a blond woman, but it’s worth noting that that woman’s sleeves seem partially unlaced as well. It’s not Cersei, obviously—for one thing the gown is all wrong—but we’ll just have to wait and see as to what’s going on.