The news says a 29 year old Russian woman died in Mt.Fuji by fallen rock and the rock fall might have been made by the other hiker.
The unskilled hikers and the crowd is No.1 RISK in Japanese summer mountain. My first alpine climbing mentor taught me not to go North Alps in Golden Week in Japan. Because there are so many unskilled hikers there without crampons on and not just rock, a human itself might come falling on you.
So, the mount Fuji's case could happen to anybody.
The news says
1) 26th, 7 am
2) fallen rock hit her head and chest
The history of Mt.Fuji fallen rock
1)1980 Aug. 14, a rock of 1 -2 m had fallen on people, and 12 were killed, more than 30 were injured.
2) In 1998, 50 cm rock fallen on a woman's head. Killed her.
3)In 2014, a man got injured his leg, a woman got broken her skull by hit of rock .
Experts say, "Most hikers are beginners. So they cause a fallen rock easily."