I might be wrong on this as I don't own an impact, but is it possible that the shroud was put on backwards and if I'm thinking correctly,wouldn't that put a vent hole in that area and possably an o ring blew resulting in the injury and the loss of velocity? just a guess from a member of the polish corp. of engineers (lol).
I own an impact and I can tell you that the shroud can not be put backward. It can only go one way. This isnt a marauder where you can flip the shroud around. Like some ppl already stated. His hand was too close to the blast. Air alone can rip skin off. Trust me. Dont believe me go dry fire into some chicken skin and it will blast it apart.
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