This song may appear a bit strange. But to me, it’s a powerful depiction about a human drawing a line in the sand and saying to the dark forces: “no more!!”
An example is Gandalf in Lord of the Rings, when he stood up to Balrog, the fire demon, to save Frodo and friends, proclaiming: “YOU SHALL NOT PASS!!!”
I have a live version of this on CD which I like better.