  Investigators are only beginning to understand how 19
firefighters lost their lives in Arizona this weekend. Christine
Pelisek and Terry Greene Sterling reconstruct what we know so
far.   Kevin Woyjeck (right) and his dad. ()     Video
screenshot  Watch a timelapse of the fire as it spread.    “It
will deflect the heat for awhile, but if the fire doesn’t get
past you fairly quickly, you will just roast inside of it.”  It
was the deadliest day for firefighters in the U.S. since
September 11, 2001.  As of Monday evening, the fire was still
raging out of control, having burned more than 8,000 acres, and
efforts continued to determine how such a tragedy had occurred.
"Whatever the situation was that took place [with the
firefighters' deaths], we haven't been able to explain yet, but
there's an investigation taking place," Don Fraijo, the fire
chief of nearby Prescott, said in a press conference on Monday.
Many details remain unclear. As the fire bore down on them, all
the firefighters deployed a safety device