I was just checking the forum to see if I could find an update on this. If anyone is curious:
I encountered this group at trail side meadow. We stopped to fill our water bottles (descending) and it was clear one member of their group was in a bad way. The group was shading him with a cloth as he leaned up against a rock. He was trying to drink water, but couldn't keep it down. I approached them to see if I could help and they explained that they were trying to descend, but their friend couldn't walk. They had triggered a distress beacon (a Garmin inReach?) and were told a litter would be dispatched. I made plans to meet back up with my crew at the portal so that they could go ahead while I stay back and assist.
The hiker was clearly dehydrated and feeling the heat. He was experiencing overwhelming lethargy and had lost some coordination. He also seemed foggy, or perhaps mildly confused, but was still trying. One of his party was concerned that he might be suffering from exertional rhabdomyolsis.
We dipped the injured's hat and shirt in the stream, gave him his hiking poles, put his helmet on and got him on his feet. He was wobbly and had an irregular gate, so his friends sandwiched him down the trail, clutching his shirt and placing his hiking poles for him and supporting him when necessary. We shuttled from shady-spot to shady-spot allowing the hiker to rest and sip water while everyone's packs were retrieved and the next section of trail coordinated.
As we descended, an alert was received through the emergency beacon that the litter had been upgraded to a helicopter. An eta was given with instructions to get to Mirror Lake. So that's just what we did. Obviously, once we got there, there was nothing else I could really help them with - so we said our good-byes & thank-yous and I continued down the mountain.
I hope that hiker is doing better today.
