I suspect many of the prisoners would want to get close to him, be buddy-buddy and in a friendly and joking manner, complain to him about how his CID and CNB officers tekaned them in the past. And if any prisoner touch NBG, the rest will galvanise their men to 'hoot' NBG's assailant.
Prison chaps will also be cautious in their dealings with him. Bear in mind this chap has lost almost everything. Wife may even divorce him when case is over. If NBG writes his book on his life's experience, the book will sell like hotcakes. Revealing some sensitive case files and some 'kelong' decisions will send his book to the bestsellers spot for months. He was Dir Manpower previously and had access to all disciplinary files. Up to SAC rank.