http://www.foxnews.com/world/2013/02...to-join-probe/
Okay, this makes MUCH more sense.
Apparently the balloon was very close to the ground and attempting to land, when the fire broke out and two people jumped out. Both survived with no broken bones (just some cuts). But one of those was the pilot!
So, 19 unfortunate souls were in a burning basket as it swept back up into the air very quickly. Topped out at 1000 feet and burst, killing all who remained. Many, like you'd expect, jumped to their deaths long before the balloon burst. One of the survivors (the non pilot) lost his wife to the crash.