Margaery’s brother Loras is also a prisoner of the High Sparrow, and when she is finally allowed to see him, she finds the Knight Of Flowers a broken man;
he can joust with The Mountain and ride valiantly into battle, but when subjected to the same kind of personalized violence and degradation that every woman in the realm must, in some way, fear,
he’s left as a shuddering husk. There is iron in her eyes when she silently realizes that she’s going to have to save them both; Loras’ kind of strength—the brasher, flashier display of power—will not work.