"I'm not sure if you're going to believe me. I wouldn't have believed it if I didn't see it for myself." He tried to deflect the topic. It wasn't really necessary to burden Sansa with more problems. He remembered her trembling body nearly crumbling on the floor from the previous night. Jon should have recognized all the symptoms when she came into his room–guilt, shame, nightmares. All things he had gone through before. He didn't need to add mythical icy necromancers of legend to her woes.