Aiden Gillen whimpers on his knees, stretching for the first time in years. And finally Sansa sentences him, and Arya swings the sword, or dagger as the case may be. For all the historical callbacks in the episode, and in its old age Game Of Thrones keeps portentously reciting old lines verbatim, this callback is the most resonant. Ned always said the man who passes the sentence should swing the sword. His daughters are finding a different way forward.