There’s still a REALLY high amount of kinetic energy in the gasses going out of the barrel. Not much range due to the jet dispersing in the comparativelly-low-pressure air around it, but at close range it carries a really considerable amount of force.
Same thing as with RPG launcher backblast from its rocket – there’s nothing going out from behind but the rocket exhaust, but it is still rocket exhaust plume, and it carries equivalent kinetic energy to the one that launches that rocket.
High pressure systems in general can be REALLY deadly, and that blank going off in a barrel is just one example of those.
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