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I would have guessed it was really cold, but she blames heat and dehydration.

Apparently the video is real, but it looks really fake.

[Capt. Tom]

but she blames heat and dehydration.

It could have been dehydration.
I have had 4 collapses through the years caused by dehydration, and 2 of them were preceded by shuddering.

I avoid it now by starting off each day with a big glass of water, and drinking another during the day.- Tom