Go North to reach the Cell Block B after a few moments. You will have to fight here several big battles with the freed inmates, and the first one of these is, fortunately, very easy. All in all, you only need to remember to neutralize the enemy with shield (stunning + stomping, or using the shock gloves), because you will be able to eliminate the rest of them without any problems. If you want to, you can blind them temporarily, by hitting a fire extinguisher with the batarang or by pulling it towards the prisoners (grapple).
After the fights finish, locate the Western staircase and climb up the stairs onto the higher level of the cell block. Walk along here, until you meet Deathstroke in one of the cells that you pass by. Reach the stairs, climb down and enter the "arena" where there is a WAY larger group of enemies. It is best to start this one of the hardest battles in the game, by using the concussion detonator or the glue grenade but, if you have been spotted, try performing a slide, at least.
I recommend that at the initial phase of the fights, you focus on inflicting damage to the martial artists. Do not wait for the gloves to charge because, if you ignore these elite enemies, they will be a considerable nuisance, while attempting to eliminate the remaining enemies.
Take to attacking the regular enemies only after you have eliminated, at least. One of the martial artists. Of course, you should try to maintain continuity while landing blows and wait for the moment when the shock gloves become available. The best way to use the gloves is for the elimination of the better-equipped enemies, meaning the ones with shields.
Towards the end of the battle (probably after you have eliminated the martial artists) there will appear an overgrown enemy around. He will be striving to charge and grab you. To the extent possible, keep away from him and take advantage of the fact that the charges will be knocking down the regular opponents. Before you start inflicting damage to the giant, make sure that the shock gloves are charged, especially that one properly landed combo should be enough to defeat this enemy. The only thing left for you to do is to deal with the inmates who, without the reinforcement of their "elite" mates should be no problem to you.
Go now towards the Western door [Panopticon Access], turn North and reach the ,area where you fight another demanding battle. After the fighting starts, deal with the weakest opponents and watch out especially for the ones that are using knives. Occasionally, also attack the martial artist and two enemies with green tubes sticking out of their backs. For the while time, avoid the charges of the overgrown enemy for the whole time.
Just like usually, wait for the moment at which the game, for the first time during this fight, will grant you with the access to the shock gloves. The strong attacks with the gloves should be directed mainly against the Venom-propelled enemies, thanks to which you will not have to worry about having to stun them with the cape. For the end, leave the biggest one of the enemies, use the gloves against him or stun him a number of times to implement a combo of standard melee attacks. After you have won the fight, take the door to the North, which will take you to the Joker's hideout [Panopticon]. Be prepared to face off with Bane again.