Very sad

The worst thing that can happen to you hiking

I practiced hiking with my former school group as an instructor for about 10 years. I simply can't imagine how you should feel if you loose a teammate, or, even worse, a kid, in such accident...
We had extremely severe conditions several times, once or twice I thought we will not get out alive, but always had some luck to help us. The worst thing that happened to my group was a broken foot. The most experienced "instructor", a guy with 20 years of alpinist experience, including hi-alt Pamir and un-classicated routes in Central Caucasus like Bezengi Wall traverse, perpared to 1982 Soviet Everest expedition, broke his foot on a stone in a brook... I spent a week with him in a tent in tundra before a group finished the route.
Nice that you guys have communication and helicopters for rescue... Hiking in Siberia makes you feel extremely "lonely" when you understand that the nearest human dwelling is more then 200km away...
Condolences to the family and teammates...