New to this forum, and this is my first post.
Watching the eye on the pommel of longclaw change colour I wondered if there is any significance in the fact that there is a lot of fresh dragon blood in that lake from Viserion's untimely demise. I haven't read the books, and there has been no mention in the series about dragons blood being in any way significant. But, Jon being a Targaryen, submerged in the water, exposed to that blood... has it had some effect on him, or on his sword? Just a thought.