And we do mean action. Dual Play in Batman: Arkham Knight allows one player to swap between Batman and a trusty sidekick during fights. For example, if you're battling a room full of nasty baddies as Batman, the AI will be in control of Nightwing -- until you switch characters, at which point the AI takes over Batman and you become Nightwing. There's also a special called the "super-combo takedown" that builds up as you fight and instantly KOs enemies in a Batman-sidekick one-two punch. "If you're building your combo with Batman and you see that there's an enemy over by Nightwing you want to take out, you can switch to Nightwing, you keep your combo, and if you've got your special charged up you can instantly use your super-combo takedown on that foe," Lead AI Programmer Tim Hanagan says in the Dual Play demo video embedded below.