I have a couple of quibbles:
"The numbness a small relief..." I know that you mean the numbness from the cold, but on my first reading, it left me wondering if the blanket made him numb. I think I would try to work the cause of the numbness into that sentence.I'm confused about the source of the faint blue light and why it makes him realize his brother's fire was out. Maybe it's the moonlight which wouldn't be visible if the fire were burning? You might make that more clear.
"Ethan's fire lie nearly out." I think "Ethan's fire WAS nearly out" sounds better.
"His brother had clapped upon building it" I don't know what that means. Did he applaud because he was happy with his fire? Is he a kid?
"He thought briefly on raising..." I think "He thought briefly OF raising..." sounds better.
I like the idea of "a period piece with a supernatural flavor." Sounds like a fun book to read.
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