Oh, I know this song! I've heard it on the radio tons but didn't realize it was by Justin Bieber. The pan flutes make it feel so late '80s/early '90s, in a bad way. That being said, Witney's made this an interesting mix of Argentine tango with an almost futuristic feel. She gets in one really great move where as Carlos turns her, she does a split mid-air. It looks like there might have been a slight flub coming out of the last big lift/spin, but Witney covered it as best she could.