Just *how* was the "Bird Hill" Fire started?

Not at all far fetched. I have seen it with my own eyes. I have photos. In the Northern Territory, during the dry season, they have burn offs. Huge burn offs. Its part of "loving the land". Raptors large and small soar in the updraft waiting for the fire to hit an open patch. At first I thought a whistling kite had picked up a burning stick by mistake, or perhaps a burning animal, and dropped it into the middle of a grass patch. Our aboriginal guide assured us it was deliberate. At the first flare birdscappeared from everywhere to share the bounty of small prey running everywhere. As the fire took hold and became too hot they all moved on.