It seems below about ~80F you lose consciousness. This kid was nearly half that. Moreover, there have been other similar cases: https://pubmed.ncbi.nlm.nih.gov/32482520/

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duskwuff 2 days ago | parent | next [-]

> It seems below about ~80F you lose consciousness.

Interestingly, the case report notes that "classic cardiac electrical activity" started once the patient reached 82°F.

	▲	wahern 2 days ago \| parent [-]
		FWIW, I got the 80F figure from the table at https://en.wikipedia.org/wiki/Hypothermia#Classification

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looofooo0 2 days ago | parent | prev [-]

Problem is that he could have drowned at 16:43.