Many of the bodies were intact, which suggests they did.
I don’t know. Sudden de-pressurization, a temperature of -40 or so.... I’m not an expert on this subject, so hopefully one will weigh in.
Try screaming for 30 seconds. Then count on another three or so from that altitude before impact. That’s a long time to be hanging upside down in your seat. Hopefully they lost consciousness without going through that. I think of the couple of car wrecks I’ve been in and it all seemed like slow motion after the initial bump that sent my vehicle in directions I did not control.