Everyone who's there said it was real. You can see the unedited moment on twitter.
What a very strange moment. I felt particularly bad for Questlove, whose amazing documentary got totally overshadowed when it was announced a moment later.
I am also very, very uncomfortable with anyone having such a hair-trigger for violence. If that's what they do in front of everyone, at one of the most televised live events of the year...puts me on edge.
Thank god for Amy Schumer and Denzel Washington, who pulled things back on track in different ways.