Can't we assume and agree that heat played a part in whatever happened? Either it was the full culprit or part culprit, imo. And if they were in the throes of heat stroke, few rational decisions would have been made at the end of their lives. Finding Dad and Baby in the middle of the trail may have been what gave LE the feeling that it was a mystery. But from what I've read about heat stroke, it progresses quickly and attacks the brain. The brain, then the body just stops.
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As someone who has had a TBI, one of my major symptoms was intolerance of heat and sunlight. A mild sunny day could make me feel crazed without a hat and sunglasses. Even 3 years later, I still suffer those symptoms, which my doctor says are not unusual.
Thank you for sharing your experience, & I'm sorry that happened to you. I had a TBI a few years ago, too. Since then, I started working in cognitive assessment for psychologists, assessing function after TBI. While for sure everyone's outcome, triggers, & tolerances are different, if any prolonged symptoms become exacerbated, it can be truly debilitating. It does seem based on their prior hikes that she wasn't overly sensitive to sun, but it seems to me that she could have still exceeded her tolerance level in these conditions.
As always, JMO.