. >>> it's known bythe nickname beantown, but inside the walls of the suffolk county jail where fights break out suddenly, the inmates have another name for the city. >> daniel espinoza helped give the little box. he had been released to the big box. general population. he had more privileges and time outside his cell now six days later, espinoza is on the way back to the middle box. >> sent away in a bus. ambulance >> the jail normally places the participants in segregation for up to 30 days. >> available for to come up for the altercation on two. >> for especially violent incidences, they may choose to file criminal charges. first staff will review surveillance of the fight >> at that table is four detainees including daniel espinoza. you can see him looking back to see where the officer's position and sight lines are. another interesting part is this gentlemen who knows the attack is coming. he is vacating the area and he will not be a participant. as the gentlemen raises his arms, that's a signal that the 3-1a tack will be ready. he begins to rise from the table and joins in. what

. >> reporter: the city of boston is known by the nickname beantown.ut inside the walls of the suffolk county jail where fights can break out suddenly, the inmates have another name for the city. >> straight from the bloody bean. >> the bloody bean. you know? >> bloody bean. >> bloody bean. >> reporter: canal espinoza just helped give the name from credence after spending 30 days in segregation, or as he calls it, the little box, he's finally been released to what he calls the big box. general population, where he had more privileges and time outside his cell. but now just six days later, espinoza and on his way back to the little box. >> we got in a fight. jumped someone. >> he got involved in a three on one, brutally assaulted another inmate. >> i beat the [ bleep ] out of him. sent him away in a box. ambulance. >> like i said, beat hick severely. passed out one time during the fight. went to the hospital, bleeding from the ear. not sure of the head trauma, if any. >> reporter: the jail normally punishing fighting by places the inmates in isolation f