I was scratching my head at the door scene as well, but did some research on our bodies at low temperatures, he lowered himself to 88 degrees:
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33 °C (91 °F) - Moderate to severe confusion, sleepiness, depressed reflexes, progressive loss of shivering, slow heart beat, shallow breathing. Shivering may stop. Subject may be unresponsive to certain stimuli.
32 °C (90 °F) - (Medical emergency) Hallucinations, delirium, complete confusion, extreme sleepiness that is progressively becoming comatose. Shivering is absent (subject may even think they are hot). Reflex may be absent or very slight.
31 °C (88 °F) - Comatose, very rarely conscious. No or slight reflexes. Very shallow breathing and slow heart rate. Possibility of serious heart rhythm problems.
28 °C (82 °F) - Severe heart rhythm disturbances are likely and breathing may stop at any time. Patient may appear to be dead.
24–26 °C (75–79 °F) or less - Death usually occurs due to irregular heart beat or respiratory arrest; however, some patients have been known to survive with body temperatures as low as 14.2°C (57.5°F).[10]
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So realistically, he was lucky to be awake at that low.
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