It was the kick heard ’round the world.

Kamaru Usman — the reigning welterweight champ and pound-for-pound the best fighter in the world heading into Saturday’s UFC 278 — was showing exactly why he hadn’t lost a fight since 2013 in his title tilt against Leon Edwards. 

Shocking isn’t the word to describe the turnaround. It was dumbfounding, and it left the entire audience in a glop of collective speechlessness.

“Undisputed” cohost Shannon Sharpe was one of the many who was left without a voice immediately after the knockout. 

But Monday morning, he put his awe from Saturday into words.

“… Edwards is a different fighter than the one that lost to Usman in 2015. He was doing a great job catching Usman with some nice shots, but Usman was winning the rounds. What Usman did was slip a punch, and lean a little bit too far, and that left foot planted perfectly upside his head. 

“That’s the thing about UFC … Until the bell goes off in the fifth, nobody is out of a fight, because like that — a foot, an elbow, a fist — it’s over! As soon as it landed, it was over. [Referee] Herb Dean just came over because he knew [Usman] wasn’t getting up from that. … One mistake and it’s [over].”