As a retired glider pilot - para division, I know the school & it's owners. No idea what happened & no intention of speculating, save to say that the owners are pilots of the first division with global reputations as anyone close to these people will know.
Hang gliding & paragliding whilst both mature forms of aviation in terms of equipment, training & procedure are still pursuits that carry risk of injury or death in common with all flying activities. They should be viewed in that light, but more importantly, thoughts should be with the family of the brave flyer who set out for an enjoyable day in the sky & didn't return.