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Originally posted by: ricarleite
That's a pretty resonable answer, although both Qui-Gon and Anakin were burned, and did not disapear at the moment they are killed. Perhaps since they discovered it "by themselves", without anyone telling them, they didn't actually had their bodies disapear but did turn into spirits. Or maybe they were burned alive
To be fair, we don't really know if Anakin himself was burned. It have just been the armor...