How do I unlock the Tower Defense AR challenge?

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In order to continue the game, I have to complete the Tower Defense AR challenge, but it is locked until I pick up a downed enemy into a beat down move. How do I do that? Is there a place in the game I can learn this move?
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How do you unlock challenges in Batman: Arkham Knight?
Unlocking Challenges To unlock additional Challenges, you'll need to play Story Mode. Most Challenges can be unlocked by finding certain Riddler Trophies. You can find a complete list of the Riddler Trophy locations here. Here is a complete list of the Challenges with the Riddler Trophies that unlock them.How do you unlock challenge mode in Batman Arkham City?
Unlock Requirement: Jump more than 50 meters in the Batmobile. This AR Challenge is a standard early-game Drone Tank battle. You'll be restricted to the car park outside of the Panessa Studios and will need to eliminate an incoming contingent of Drone Tanks.Batman Arkham Knight Tower Defense (3 STARS) Combat AR Challenge
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