AlwaysOnTheCase
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This may be another reason that Shane was "stumbling" over the bridge:
"In slow hypothermia, by the time body temperature drops to 90°F (32°C) both the central and peripheral nervous systems are impaired, primarily due to decreased blood flow to the brain (6-7% per °C18): People are physically and mentally clumsy, show decreased sensitivity to pain, have slowed reflexes, and may hallucinate. Thus, a medical school mnemonic for hypothermia symptoms: “stumbles, mumbles, fumbles, and grumbles,” which summarizes changes in motor coordination and consciousness.
Sleepiness (“cold narcosis” occurs at around 86°F (30°C) core temperature. At around 81°F (27°C), people stop responding to verbal commands, and some reflexes (such as the reaction of eye pupils to light) stop working entirely. Knee jerk is the last reflex to go,j19 at 79°F (26°C). The body’s temperature-regulating mechanisms also fail and there is quick cooling until the body reaches ambient temperature. However, there is the usual individual variability, with recorded reflexes as low as 68°F (20°C)"
With his low body fat and minimal protective clothing, he may very well have begun experiencing the effects of hypothermia.
Maybe Chuckmaureen can help us with the windchill factor that night.
http://www.businessinsider.com/how-long-does-it-take-to-get-frostbite-or-hypothermia-2014-1