Why do you think the father keeps going, when the easiest thing would be to give up?
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The father's instinct is to keep his son alive. That is all he knows how to do. The best thing might have been to kill the boy and himself but the man thinks the boy must live for a greater purpose,
My job is to take care of you. I was appointed to do that by God. I will kill anyone who touches you. Do you understand?