As others noted, nobody was hurt.
I worked on the Teleoperator Retrieval System (TRS) which was a small booster with an Apollo docking ring that an astronaut would remotely pilot from the Shuttle. The docking ring was supposed to clamp onto the Skylab docking port and then the booster would either push Skylab to a higher orbit or perform a controlled de-orbit. It was initially scheduled to fly on the 5th Shuttle. Then as the Shuttle main engines were being debugged at Stennis, it was scheduled for the 4th, the 3rd, the 2nd, the 1st and then it was, "Incoming!".
The uncontrolled reentry was pretty much a non-event except that it took a while to find any debris.