No Mark, No Breach
Without the mark, the Children’s wards on the cave hold that night, avoiding the emergency flight, the Three‑Eyed Raven’s immediate death, and Hodor’s sacrifice. Bran continues training under controlled conditions and leaves on his terms, likely with a clearer grasp of greensight before reentering the war. Downstream, the Night King loses the clean fix that later justifies the Winterfell bait plan. The invasion still requires a physical breach at the Wall, which canon anchors to Viserion’s blue
- S6E5: “He can now. His mark is on you.” immediately precedes the cave’s first breach; Inside the Episode affirms the mark let them in.
- S8 council: Bran says the mark lets the Night King always know where he is, grounding the Winterfell bait plan.
- S7E7 episode/script: the Wall falls to Viserion’s sustained blue fire; no reference to Bran’s mark.