before i came here i thought i was. but i'm not. i'm just me. i'm jerry. >> juan rubio continues to bide his time in a segregation cell. eager to return to a mexican mafia housing unit, despite being expelled from the gang. >> what do you do while you're in there? >> i read. work out. think. >> what do you think about? >> my life. how i'm going to fix my life. i get out and i do the same mistakes over and over. i've been doing it all my life. but i'm going to get out. i'm going to get out, and i'm going to change that. >> rubio's latest troubles arrived after he broke one of the mexican mafia's most important codes. he attacked a jail officer.