Roose ended up betraying the Starks and the North by teaming with Walder Frey and Tywin Lannister. He saw to it that Lady Catelyn, Robb, and Talisa Stark did not escape the hall at the Twins.

As a craven, petty, and resentful Riverlands lord, Walder Frey was disliked by everyone in the realm even before he played an instrumental role in the show’s biggest shock-and-awe massacre.

The scene it refers to is the Red Wedding, a wedding that takes place in the Frey territories, though it is actually a revenge plot orchestrated by the head of that house, Walder Frey. Robb Stark ...