"Her demise isn’t a heroic sacrifice — if anything, it works as a tragic byproduct of her complete inability to keep her bright ideas to herself, turning one of her silly quirks into something lethally serious. It’s great in a completely different way from Stark’s death, and it’s tremendous evidence that the show is playing for keeps in its final season."
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Yep. Holly’s demise was well written, well played, surprising yet completely in character.