You are correct. That fire had been contained by the hard-core firefighters who had been up there. The four who died were part of the "mop-up" crew that had been sent to take care of it afterwards. This crew were informed by the crew that had contained the fire that they had requested a water drop and it should be there shortly.
The mop-up crew proceeded to call about the water some hours after the expected drop. The fire got going again and these kids were killed (and I do mean kids --- look at the ages).
This is b.s. written in hopes that most people are not up on the facts behind this fire, and the media is too lazy to fully report.