All the tests show low speed impacts/crashes, I'm curious as to how well it would work in a high speed impact where your head hits the ground going forward, is

All the tests show low speed impacts/crashes, I'm curious as to how well it would work in a high speed impact where your head hits the ground going forward, is it attached firmly enough to stay in place? Also, how does it know when to inflate? Can it be repacked? It looks interesting, but I'll stick with my regular helmet for now, even if it isn't stylish.