On those space blankets: With that many injured people, the medical people are going to give priority to the ones most OBVIOUSLY injured. There can be others who are just as badly injured, but it's not as visible. Shock caused by injury can cause changes in body temp and blood pressure to the extent that people can die fairly quickly. I'm sure that the overextended medical people on site gave as many blankets out as they had available, just in case.
The worst adrenaline high I came down from was when I was on nitrous oxide at the dentist, and apparently they ran out of oxygen in the companion tank. I had trouble breathing, then started gasping because I wasn't getting air. A few minutes later I was shaking and cold. (BTW, you've never seen all that apparatus removed from a mouth so fast -- really!)
And sometimes, a blankie is just nice to have. Ask Linus.
Sue