Grosjean spent early 20 seconds in that fireball. Cars going through the barrier and bursting into flames didn't use to end well. I think the real miracle is that he stayed alert after that instant-stop crash. No doubt HALO did its job, and what about the medical car staff, Alan van der Merwe and Dr Ian Roberts?
Towards the end, I couldn't believe it when I saw that marshal run across the track with a fire extinguisher; F1 has already had fatalities exactly because of that...
Pictures from Autosport: