How the hell did Beck Weathers wake up?

I’m not a mountaineer by any stretch, but Dr Weathers’ story has stayed in my thoughts since I first heard it. It really does seem like a miracle that he survived, especially after fifteen hours, in the death zone, (temporarily) blind, and in a hyperthermic coma. All the articles I’ve read leave it at that, but my question is if anyone in the medical or adventuring community has any theory as to how this happened. I know that people having seemingly come back from the dead after getting frozen, but that’s usually after getting rescued and treated. Beck meanwhile was oxygen deprived, exhausted, and presumably hungry and thirsty. And somehow, he not only woke up and climbed down but seemed to have no brain damage or the like after so long in the death zone.

Is this less crazy as it seems in context, or was this really just an act of God?