In this quest the player has to slice red and blue cubes with a virtual lightsaber. This is the 2nd most athletic quest after body combat. I think similarly to body combat the red and blue colors here belong to the left and right arm, so you have to slice them with the color matched lightsaber.
On mobile devices click on the cardboard icon to use a VR headset to look around
Look around with directional swipe gestures on touch screens, or use the top-left Google Street View like controls of the YouTube video. Use cardboard or VR headsets if available for more immersive experience.