<Li> The inside / yard scenes were filmed in Dallas on a set at an old converted juvenile jail on Harry Hines, south of Parkland Hospital, just east of I - 35 . </Li> <Li> Many other scenes filmed at the Studios at Las Colinas in Irving, Texas . </Li> <P> One vital aspect that sets Sona most apart from Fox River is the chicken foot . Any grievances between inmates can be decided by method of the chicken foot, which involves one inmate giving the chicken foot to another and hence challenging them to a fight to the death . Once the chicken foot has been handed to an inmate, they have no choice but to fight, and as the rules of Sona state, fight to the death . With the rest of the prison watching and forming a circle around the fighting pair, the inmates battle it out until one is dead, with Lechero acting as the referee, and each inmate allowed to use no more than his bare hands . As Lechero says "Two men go in, one man comes out". In the first episode of Season 3, Scofield is given the chicken foot, and is forced to fight with only the advice of Mahone, before his opponent is given a weapon and attempts foul play, signaling Mahone to finish him off in Scofield's place . Later in the season, Bellick also attempts foulplay, by dipping rags in acetone and wrapping them around his knuckles, which he then uses to stuff in his opponents face, rendering him delirious . </P> <P> Although the guards remain outside the prison for most of the time, they are still heavily armed and very dangerous . Between the very outer fence and the walls of Sona is No Man's Land . Guards frequently watch this area for any escapees . In episode one of Season three, an inmate that Brad Bellick had somewhat befriended escapes through a broken window out into No Man's Land, where he is shot to death after attempting to run across (See Escapes below .) Even a rat coaxed by food scraps thrown into the area by Scofield, at night, is nearly immediately shot at . As the perimeter guards double in number at night, Michael says that a night - time escape is impossible . However, Lechero, T - Bag and Bellick all try to escape in the early hours of the morning under the cover of darkness, but in vain . In the break - out attempt, Lechero is shot and severely wounded by one of the tower guards . </P>

What does the chicken foot mean in prison break
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