Sean Smith could not find Stevens in the mission house before he himself died. Stevens spent a LOT of time breathing hot dorsal fumes and smoke, maybe hours, maybe not, but oh my, life threatening in the best of circumstances.
I thought about who would bother to take him to the hospital, unless it was late Libyan rescuers, or the enemy who did not mean for him to be harmed, but kidnapped perhaps. The administration stayed mum, yet they knew the hospital used Stevens cell phone numbers to try to make contact with his last calls, likely to Tripoli.
Just one or two inhalations of some burning vegetable oil will give you a royal headache, nausea and make you short of breath for a day or two. Smoke from burning building and furniture has got to be a lot worse.