Does not seem possible
Are we siupposed to accept the notion that a Gendry ran back to Eastwatch and had a Raven sent. The Raven would get to Dragonstone that fast AND have Danarys fly up to north before the water freezes? How long were they waiting. Makes no sense. How the heck long were they their? Lastly, skipping over the fact the White walkers had giant chain at their disposal,how did they get the chains on the dragon? If they entered the water, what prevented them from doing the same with the group they were waiting to kill.
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