I heard just from the pressure when O2 gets to the end of the line it spikes to about 300 degrees. That is well over flash point for many substances and once one starts all of them will go in an O2 fire.
But for a bit of fun try liquid oxygen on a fire That really gets the cooking done fast. http://web.archive.org/web/200210032...rdue.edu/~ghg/ There a few pics here.

Matt