The duet was meh. It was obviously sloppy and last minute. And their voices didn't really fit the way I thought, cause Ariana's is super high and girly and Xtina's is raspier, more throaty and deeper, so it didn't blend well. It was great to see Christina give Ariana so much space though. She didn't turn it into a race
But Legend's star quality is JUST...

The way she walked in, the way she looked at the camera. I miss her so much.

Ariana still has to improve on that aspect, cause I felt like she was getting lost among the dancers and stage props, while her presence was so much stronger on her recent VEVO concert where there was no stage production and fewer dancers.