PRESCOTT, Ariz. — Shortly before flames engulfed his comrades, the Hotshot firefighters' lookout radioed his team that the blaze had shifted direction with the wind and that he was fleeing for safety. The harrowing experience of the elite crew's lone survivor was detailed Tuesday by a Prescott fire official, who also defended his department's actions in the tragedy that killed 19 firefighters. The deaths raised questions over whether the crew should have been pulled out much earlier and if standard precautions would have made any difference in the face of triple-digit temperatures, erratic winds and tinderbox conditions.