Woke up in a dream state
In a cold sweat like I got hit with a freeze ray during a heat wave
The whole thing was too crazy to be real, it was all just a dream that he suddenly wakes up from. He goes from one dream to another.
A heatwave is intensely hot weather way past the norm, it’s so hot it would melt ice, getting hit with a freeze ray would do nothing but cool him down but it wouldn’t stop the sweat.
He’s playing on cold sweat here, which is a bodily reaction to emotion (ie. fear, nervousness, etc); sweating while having chilled and moist skin. Sweating usually happens in the heat.
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