With proper care, exposed bone can heal, according to a human medical site (search "Wound Care for Exposed Cartilage or Bone", the University of Wisconsin has a health fact sheet on it)...seems like we can extrapolate this to poultry. In short, it says to keep the wound moist and covered (they recommend using petroleum jelly).It's just his wing, he can stand and seems to be in not much pain or shock. He's eating and drinking also... I'm just worried about the bone being exposed.