This cell represents the fight that just makes the setting unsafe. The kid yelling "your going to pay for that new fish." (Gordon smith pg 101)Saying that tells you that something happened to cause this fight.
now after the fight the kid Alex who got into the fight almost cost him his life because the siren means that the cell doors are closing. Alex was on the ground and one of his friends got him up the made a run for it because the guard and the hounds come out so the made a run for it. this group is good because they stick together " What ever they've got in store for us, we've got to stick together."(Gordon smith pg 52)
In this cell the cell doors are closing and the hounds are right behind them so they hightailed it to the stairs. "come on" (pg 104 Gordon smith)