He does sound genuine. Underground fighting ring in prison, no doctors sewing his own wounds with guitar string.. seriously, who would make this shit up?
it's not an 'underground ring'... not like prison guards betting on bouts like you see in tv.
but where I was, we weren't in 'cells'.. I was in barracks... like a big huge tin barn, sectioned off in 4 sections (1 being the 'hole', with actual cells. where the walls are painted baby pink and baby blue and the lights never turn off and you don't get a blanket or a pillow, and you have no idea what time it is.. ask a guard for the time and at best you get "day time" .. or "night time"... and you get about 15mins (supposed to be 1hr, but it's not) per day to take an ice cold shower in the winter and a steaming how shower in the summer..)anyways...... so at 10pm/lights out, the guards only do rounds about twice an hour and we'll have 2-3 guys on lookout for guards coming in from either doors (there were 2 entrances), we'd fight/grapple on bare concrete (polished concrete, not 'sidewalk' concrete) with no timelimit until somebody gave up or was un-responsive (choked out or knocked out).. and it's dark, so many times I'd get choked out and could feel myself 'falling down the rabbit hole', but it's dark, so nobody can tell if you're out or not, and the guy will get tired of holding the choke, and a few seconds later I'd regain conciseness, still in the choke and keep fighting... we'd try to avoid elbows and stuff that would cause a pretty bad, obvious injury with a lot of blood.. since if a guard came in and saw blood all over the floor they'd turn on all the lights and go around checking everybody's faces and knuckles and clothes and a bunch of us would get sent to the hole (since a bunch of us would have bruised faces from just grappling on the concrete)...... there's usually no time-limit, and we'd bet on who we thought would win and the winner would get 'tips' from the guys who bet on them, or we'd put up our own money and bet on ourselves, ect... it wasn't about the money, it was about who had the most heart, because a lot of guys would just quit. they'd get tired, or just didn't want to get hurt...... one guy, a white kid called "mouthpiece" dude was a wigger and later found out a snitch... would brag about "I've knocked out 22 ppl.. never lost a fight.. blah blah blah"... well, he stuck is nose in my biz and cost me some money so I wanted to wrestle him.. told him he could strike, but I wouldn't.. so he clips me 3x, chin, jaw and on my ear and I wasn't even dazed (so much for his self-purported rep of being a knockout king), I took him down and got him in an arm-bar (I'm not even good at arm-bars.. I prefer chokes) and hear his elbow go POP/CRACK and his arm bends backwards and he screams like a little girl and starts crying "my arm! my arm!" bwwahahaha... just dislocated his elbow, which went back into place right away (a farily common thing) and tore his bicep (not that he had much bicep anyways), but he never lived down that crying bullshit he did.. lol