disturbing photo shows cortez berry hunched down with a swollen eye in front of two shirtless young men , one of whom is holding a leash .
berry told family members he was jumped by ten other inmates and guards did n't check on him until six hours after the incident .
department of corrections is investigating and believe the incident was gang-related .
mom demetria harris said she wants an assurance from the department that he will be able to pay his debt to society , without being killed .
berry has since been transferred to a different prison , where he is now in protective custody .