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$3.$ You are hiking in the mountain on a fall day that starts warm but is quickly getting cooler as clouds move in overhead. Although the exertion is still making you sweat, you feel cold as the wind picks up and a steady rain begins to fall. Your hiking partner, Hafiz, is shivering and complaining that he cannot get warm, despite having put on all the layers of clothing she brought along. He states that everything he is wearing is soaked through anyway and asks if you can stop walking for a while as he does not feel like fighting the wind and rain anymore.

a$)$ What cold$-$related emergency is Hafiz showing signs of$?$

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