I don't think it is very plausable that Hannah was shot, but I'm basing that on the crime scene itself as I don't have knowledge of gun shot wounds.
I would expect that if there was a gun involved it would have been pointed at David, not Hannah, to stop him preventing her rape. If two guns were used (one to threaten David and the other to threaten Hannah), one could have gone off accidentally during or after the rape. It makes more sense that the rapes occured before the head injuries and that David was incapacitated before the attack on Hannah took place (unless there were more attackers). So, they could have stabbed David in order to attack Hannah and then shot Hannah after. I can't see why they'd bother retrieving the bullet, unless it was registered to them. I don't have much knowledge at all on gunshot wounds, but I really doubt there'd be a bullet to remove as such. There'd be many fragments to do such damage. Is it right that most guns carried on the island are hand guns? Would a handgun really have done such damage? I would expect something far more substantial. That would make it less plausable that someone would just happen to be carrying it around with them and it wasn't witnessed or captured on CCTV.
Sorry for the late night ramble (it's 5am here, bed time). This case just bothers me so much. The level of violence makes it so terrifying that guilty men could escape justice, or innocent men may face the ultimate punishment for something they didn't do. I can't understand how their families are coping in any way, shape or form.
