You ' re extrapolating from a propane jet like a welding accident , right ? You ' re saying a BLEVE can ' t occur at this scale in these kind of conditions ? With all the discussion of IEDs based on 5 lb cylinders , there are consistent recommendations to respect a blast radius much larger than the fireball . You ' re also not considering , in the event that it was an IED , what they were trying to use to trigger the explosion . A blasting cap ? Regards the flashbang , you ' re conflating the fact that something might be possible under specific circumstances with it being probable . By that standard , under the right circumstances , a baseball can easily kill . The vast majority of flashbang injuries seem to emphasize burns and lesser damage than the photo appears to show . Could she have been lying on the thing or holding it ? Might circumstances have led to her being one of the exceptional cases ? Sure . But you can ' t say that ' s likely what happened from what we know now we ' re stuck with recognizing that what happened to her isn ' t the usual for a flashbang . As I understand it , the ATF is looking at the evidence and they know more than either of us so waiting before making definitive statements is prudent . That won ' t satisfy people who are trying to shoehorn facts into a narrative , but nothing likely will .