The thing is he may have been fine initially, but being out in that baking sun can easily give you heat stroke or heat illness.His wife is also a doctor, maybe she should have been more forceful by stopping him walking off alone, unless he didn't fully convey to her how unwell he was feeling. Easy to say with hindsight though.
I think I got it once on holiday (or was on the verge of getting it) after being out in the baking sun for a long time in a dry heat (you don't feel that hot) with 40C temperatures and I didn't realise until I suddenly started feeling very unwell. Drinking a huge amount of water, going straight back to the hotel by car (someone else was driving of course) and lying on my bed for at least half an hour eventually started to sort it out, but it was not pleasant.
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