No doubt. Unsafe practices; probably an illegal worker; probably no safety training for operating the nailer.
By the by I would NOT want to own a home anywhere, let alone huricane country, where 2X4's are nailed to concrete with a 2 1/2 inch nail; that is only 1" penetration, and not even the right type of fastener. 8" X 1/2" diameter concrete-embedded J-bolts, on max 4' centers, anyone?
Good point, only 1" penetration isn't probably even to code.
Maybe the story was not complete and he was securing stud to stud. Then used the wrong nail, which didn't penetrate the concrete and ricochet into his eye????