@futurebird Vinyl chloride. If I understand correctly they added more fire to it because the safest way to deal with that chemical is to increase the energy to encourage the nasty compounds it reacts into to continue reacting into less toxic compounds.
... one of those deals where if you find yourself in the cloud, you *hope* to survive long enough to worry about the carcinogenic effects.
@mtomczak @futurebird Think I read that they opened up the cars to dump the vinyl chloride into a ditch in order to burn it off 'safely' as the risk of a catastrophic explosion (debris radius of over a mile!) was too great