During the Red Wedding many people were killed, including Robb Stark, his mother Catelyn, his wife Talisa and many of his bannermen, while the young Arya Stark, who had sneaked into the Twins' courtyard in the hopes of reuniting with her mother, managed to leave the castle thanks to The Hound's decision of knocking her unconscious. In Game of Thrones season 6 finale, after her training in the House of Black and White, Arya killed Walder Frey in his castle (along with Lothar and Black Walder), disguising herself as a waitress.

Following an interesting theory by Reddit user kaztrator, we successfully predicted the way Arya was going to kill Walder Frey.

Now that season 6 is over, the secret symmetries behind the "Revenge for the Red Wedding theory" are finally confirmed.

Tywin Lannister, Roose Bolton and Walder Frey.

The Red Wedding massacre was orchestrated by Tywin Lannister, Roose Bolton and Walder Frey. During the shocking Red Wedding episode, Robb was shot with crossbow bolts and then stabbed in the stomach by Roose Bolton. Catelyn Tully was shot with bolts as well, and after Robb was finished, the Freys slit her throat.

Divine retribution: Tywin, Roose and Walder's deaths.

Tywin Lannister was shot by Tyrion in his own chambers with a crossbow. Roose Bolton was killed in season 6 by his son Ramsay, who stabbed him in the stomach in his own house, in a scene extremely similar to the one depicting Robb's death. In which way Arya killed the old Walder Frey? She murdered him in his own house, at the Twins, slitting his throat (the way Catelyn was finished).

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The young Stark also killed two sons of Walder who were responsible for the Red Wedding: Lothar and Black Walder.

Will the symmetries be confirmed in The Winds of Winter?

We don't know if these symmetries will be confirmed in The Winds of Winter (the next George R.R. Martin's novel). Probably not. But we think that Game of Thrones showrunners intentionally depicted Roose Bolton and Walder Frey's deaths in a way that reminds us of the Red Wedding massacre, adding a sort of karmic justice into the mix.