segregation, or the hole, a disciplinary unit where inmates are locked down 23 hours a day. what landed him here? he viciously beat up a rival cellmate. >> what provoked it? you know what i mean, i don't want to talk about that. because i could be considered a rat. you follow what i'm saying? for giving up information, for giving up game. for explaining how it is in here. >> that's a ten-four. we'll keep that area clear until we're complete. >> as in most prisons, the exercise yard can be the most dangerous place in the facility. >> right off the bat you can tell when something is going to go on. it gets quiet. guys are grouping up in different races. you've got blacks, whites, everybody. >> if violence does break out, yard gunner hosso is well equipped to respond. >> co gas. i have batons, direct foam rounds. it's a less lethal weapon. this is a deadly weapon. this is a lethal weapon. this is a mini-14. it's exciting, but then again, it's not as exciting to see some of your teammates out there, some of your partners get attacked and assaulted. it happens a lot. >> we're always looking for something.