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It happens. It's pretty common to find blood on a deployed airbag. However, the injuries caused by an deployed airbag are invariably less severe then those you'd get from headbutting an unprotected steering wheel or other similarly unforgiving part of a car.
It's the same with seatbelts. If you're in a heavy crash, the chances are you'll get bruising from your seatbelt. However, it's better than the alternative.
"His wounds, some at least caused by an airbag deploying,"
Is that how they're supposed to work?
RIP young lad.