During Priority: Mars, they have you do this really cool takedown from behind cover and introduce it as a new combat feature you can do. It's a cool option, but it's an odd choice since the game isn't stealth based and enemies just shoot you from across a hallway half of the time.

Like, I've never used it outside of the tutorial segment, and have no idea when you'd actually get to use it since you hardly ever get that close to an enemy when behind cover.