I think he's talking about fear...once he takes the hand of the dark mistress (the night), lets his guard down (his armor), he'll be walking further away from his comfort zone (the light) and into the unknown and uncharted where he'll be free of the things he's allowing to hold him back and down and as this is happening it's taking him on a journey to understand things about himself that he obviously didn't know...finding a strength he obviously didn't realize he had.
"Are you going to be a slave for the rest of your life?" When you let fear and apprehension guide you become a fear to it, when you stop questioning and start doing you'll find yourself doing things you didn't realize you could. In essence, the night saves his life...
Ari
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