Isn't a 3rd degree burn one that's down through all the layers of skin? 43c is only 109F. While hot, it's hardly uncommon. Especially in Arizona.
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The accounts I've seen have involved doing things like walking barefoot on hot surfaces. Solid objects in the sun can be a lot hotter than the air temperature, and be much more effective at rapidly transferring heat into your body.
If you passout from exhaustion and your skin is touching metal... Or maybe prolonged sunburn? I dunno... Just brainstorming.
Also the UV index can vary significantly, regardless air temps. Perhaps that also caused some severe burns.
When ladbible starts to report on climate
This seems to be the common evolution. Buzzfeed has the best investigative journalism for a while