“Burn them all”
Game of Thrones season 6 episode 6 Blood of my Blood was Bran Stark’s visions. In a short span on time Bran went from the past to the present and then to the future. He witnessed the creation of the White Walkers, saw the Mad King Aerys and also saw Jaime Lannister slaying him. He probably saw Lyanna Stark and the beheading of Ned Stark, the Red Wedding, the Hardhome scene. He also witnessed the birth of the dragons.