Take Down Nightwing, Rescue Ivy
The reunion is cut short, however, as you’ll be ambushed by another 5 cops. If you’ve saved your Mayhem Mode you can unleash it now, and make quick work of them all. If not, deploy the same methods you’ve used earlier to take them out of the picture.
You’d think at this point there’d be no one left to try and stop Harley, but nope! Nightwing makes his grand entrance to try and put a stop to Harley’s plans once and for all. Harley and Bat Night Nightwing will have a little high-noon stand off before Nightwing charges at you, his electric batons at the ready.
The game will prompt you to cartwheel towards Nightwing and leap over his head and attack him from behind, and the way the game starts moving in bullet time you might be tempted to. However, a much better option is to cartweel away. This is because leaping over Nightwing’s head will land you right into the arms of a group of cops who will also join the fight (where do they keep coming from?) Instead roll back a few times and Nightwing will chase after you.
Once you and Nightwing are alone in the corner you can now leap over his head. You need to do this, because Nightwing fights with his electric weapons which will damage you if you try to attack him head-on. When you’re successfully behind Nightwing hit him with your bat to stun him, and wail away on him with the regular attack button. If you manage to pull this off before the cops reach you Harley will end her combo in a takedown which will cut a huge portion of Nightwing’s health.
From here it’s just a matter of countering, attacking, and taking down any cops that get too close while also leaping over Nightwing to hit him upside his head when he’s not looking. Don’t focus too much on the cops, because they will just keep coming. Instead work up enough of a combo until you can execute a takedown, and do your best to use those takedowns on Nightwing himself. He’s vulnerable to them and it will shave off a ton of his health every time.
An even better strategy might be to build up your Mayhem meter, as you can attack him with consecutive takedowns. Keep this up and you’ll make short work of the boy wonder. After you’ve beaten Nightwing he will get back up, only to be ensnared by vines controlled by Ivy’s mind. With him out of commission you’re free to spring Ivy and put Scarecrow’s plan into motion. Good show!