Everything is possible.
Excepts from http://www.vietnamese-american.org/b1.html:

During the Second World War, troops found Japanese shelters which had been struck by napalm bombs in which all the occupants were dead without having been burned at all. These soldiers had died, apparently without pain, and with an expression of fright and surprise frozen on to their faces; they had been instantaneously and massively poisoned by carbon monoxide. The only way to escape the asphyxiating effects of napalm is to flee into the open air - where the direct destruction by burning from flaming splashes is greatest. In a strike zone it is almost impossible to escape the effects of napalm by taking shelter, for one cannot hold one’s breath for the time it takes napalm to burn off. The carbon monoxide poisoning itself paralyses the will and robs the victim of the ability to move.