Although Arya is my favorite character, and though it's faithful to the books more or less, I thought Maisie Williams doing the Molly Malone bit looked a little silly. Poorly directed and acted.
It doesn't matter. All of Westeros will be crushed by the White Walkers and the Undead. You have to burn the bodies to kill the Zombies. There is no way to do that. You'd need fire breathing dragons or something, and they haven't been seen in Westeros in hundreds of years.
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I thought getting old would take longer.