How does Eliezer's march from the camp take on a surreal quality?

The SS officers make the prisoners run through the snow, and they shoot those who fall behind. Eliezer feels separate from his body and wishes he could get rid of it because it is so heavy to drag along. He begins to run mechanically and starts to lose his sense of self.

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In this section Eliezer and the other remaining prisoners are pushed to the very limits of human capacity, both physically and mentally. Forced to run at least forty-two miles, Eliezer's mind feels like it is becoming disconnected from his body, and he continues to run mechanically without really realizing that he is doing so: "I was dragging with me this skeletal body which weighed so much. If only I had got rid of it! In spite of my efforts not to think about it, I could feel myself as two entities‹my body and me. I hated it."