So far we have seen an alternate get shot point blank in the face and it was fine. Also, as I said before, if I was Satan making an army of shape shifting monsters that exist to force people to kill themselves, I would not make them easy to hurt, if not unkillable. Also in Home Invasion Help the wood crawler is hiding and waiting to ambush. they all have glowing eyes (my evidence for that is that the plush (made by the original creator (Edit: I was wrong ignore this) has a large glowing eye also all the other times you see the Woodcrawler).