As an amateur rock climber these always get me. Like someone else said its always the little shit that kills people in this sport. He essentially didn't do the "phone, wallet, keys" check of the rock climbing world i.e. the phrase "belay on" (essentially rope secured).
Highly reccomend the Free Solo movie if you want 2 hours of straight anxiety and are interested in the rock climbers world.
I wouldn't trust this company with making a cheese sandwich, they'd start an additional kickstarter for the mayo-ssjmatthew on Comcept's MN9