I'm very sorry. It is normal for them to be traumatized after an attack, after a few days they should become a little braver. Coaxing them with treats may help.
Could you gently peel off some of the bandage, and post a few pictures?
If you haven't already, I would trim some of the feathers around the wound, flush it with some saline, and apply an ointment like Neosporin, or Silvadene cream. Bandaging it would be good, just ensure there is plenty of...