My understanding (based on what might well be outdated information) is that the bar is considerably lower in many European jurisdictions with respect to calling for rescue. I saw this vividly years ago when on a mountaineering patrol on Denali. A European climber had basically had enough fun and asked for a helicopter rescue. This was at advance base camp, about 14,000 feet. It developed that he had incurred minor frostbite on his feet.
The NPS protocol for that situation, which we conveyed to him, was, "No problem! Don't thaw out your feet but proceed directly to the airstrip (7,000 below us), fly out and seek treatment." He was pretty disappointed, to say the least.
I believe most European climbers carry rescue insurance, which allows them to summon helos, etc., very easily.
The situation, as described, hardly merits rescue. When the fog rolls in, you stop moving, and maintain 98.6. I am surprised that they could not backtrack, at the very least.
A problem here is that the news accounts are very sketchy and omit, as always, important information. It would be revealing to talk to someone involved in the operation.
I must admit that this German guide seems pretty lame.
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Geezer in Chief