Quote:
Originally Posted by DaFace
Maybe the show implies that they go down quicker with dragonglass? Or that they'll at least stay dead? 
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Dragonglass/Valyrian Steel (Dragonblade) severs the enchantments of the Night King, the White Walkers, and the wights.
So striking down a walker with a dragonglass or Valyrian steel weapon means they go down to normal killing blows, versus attacking them with a normal weapon and having to hack them to pieces and light them aflame to put them down (see Snow, season 1, vs the wight to save Jeor Mormont).
It’s not a plot hole.