The court looks on as Joffrey chokes to death. As others have noted, Tywin Lannister is shown covering Tommen’s eyes so he does not watch his brother’s gruesome death. An interesting choice on the part of the production.
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Tywin Lannister, Tyrion Lannister, Tommen Baratheon, Season 4, Margaery Tyrell, Kingsguard, EP402