I don't understand why there weren't taking Gendry's hammer to the ice non stop to keep it from freezing over... and also makeing a place they could get drinking water, maybe even catch a fish somehow. Do the people in this made up world not understand the dynamics of water and freezing?
But then again, it was freezing north of the wall, how the heck was that not completely frozen over anyway?
How did John know Gendry was the fastest? Did they do time trials before leaving? He said it like it was a fact. Even if Gendry was hypothetically the fastest, they didn't need a sprinter, they needed a marathon runner. Surely a Wildling would be a better distance runner in the snow than Gendry who had never even seen snow before. Why didn't they all run back to the wall, where was Jon going?
Has Benjen been stalking them? Pretty unlikely he just shows up then. Unless Gendry sent a raven to him as well.
Why was there a fire? Did they plant that there? I'm so confused, why not just attack? Did they run back, build a diversionary fire and then ambush the White Walker and his posse? If so, that seems a bit convoluted. It seems more prudent to just ambush them when they don't think anything is up.
So many plot holes and hero shields in this season's GoT that really takes away from the enjoyment of the show if you want there to be any logic at all in it. How did Jon not freeze to death?