That chilling final scene ? Great story telling. Couldn't help wondering where that Ice Lord conjured up 400m of high grade steel chain link from within the icy wastelands. Perhaps screwfix has a branch north of the wall.
I'm not having that epsiode, no sirree. Utterly unrealistic. Look, if you're fannying around in sub-zero temperatures, no food or sleep for days, then you fight a battle, if you go swimming in a frozen lake, crawl out and get on a horse you're going to die of hypothermia in a bout 3 minutes.
The bounds of my credule have been overstretched.