Batman: Arkham Origins Blackgate - How to Beat the Joker

At the very beginning of the fight, use the Line Launcher to kick into him. Now, the fight really starts, as Joker pulls out a pistol. Stay on the opposite side of the barrels, making sure to roll-dodge as Joker's reticle closes in on you. After three shots, Joker needs to reload; run up and punch him when he's distracted. For the third phase, Joker will pull out an electrified baton and start charging