The whole capture a zombie side plot bugged me.
Why didn't they just fly a dragon up there in the first place and snatch one in a day if this is their main focus now?
Also, where in the hell did the White Walkers get a pile of giant chains to pull the dead dragon out of the lake? All they have shown thus far is a shambling horde of corpses.
They've been carrying giant chain around with them the whole time? WTF.
