Since I'm the one who placed the quote, I'll explain that bone in a living animal is living tissue. Bone cells continually arrange and rearrange the calcium salt crystals which make up the hard load-bearing structure of bone; they do that for injury, as in a broken bone, and in response to changing stress, as when the astronauts in extended weightlessness loose bone mass. Any injury that physically damages a bone is eventually repaired or "paved over" with new bone. My son has a screw in his elbow from a childhood accident; at twenty, surgery to remove the screw failed because it had been locked in by bone growth around it. In the photomicrograph that accompanies the quote (from Dr. Firestone of the Berkeley Livermore Labs) the "nugget" of metal has been encased with bone growth; compare to the photos of the tusk embedment.
Oh, I wasn't asking for an explanation of why there is new bone growth.
I am asking skeptigirl why there is new bone growth, if the animal was killed.
But thanks, anyway!