What happens to Nomex,  untreated Cotton, and untreated Polyester/Cotton when exposed to a flash fire?

Nomex extinguishes once the ignition source is removed.  The Untreated Cotton continues to burn until there is nothing left. The Untreated Polyester/Cotton blend continues to burn until there is nothing left too, but it also drips and melts.

Which one would you want to be wearing if you were exposed to hazardous ignition source?