De acordo com o este artigo , o GRRM confirmou:
the word brienne screamed was “sword”; lady stoneheart gave brienne the choice of either swearing her sword to her or being hung, saying “sword or noose”, and as brienne was being hung she screamed “sword”
Isso pode ser inferido do texto, já que, como disse George, Brienne teve a escolha de duas palavras no AFFC. E nós
See her later on in ADWD, implying she said the word Lady Stoneheart wanted to hear.