Editor's note: The video above is from December 2019. Scroll down to see the video of the knockout.
A spinning heel kick at a UFC event Saturday is being called by many commentators and fans the greatest knockout of all time in the octagon.
Impa Kasanganay was battling Joaquin Buckley in the middleweight bout.
With three minutes left in the second round, Buckley tried to kick Kasanganay with his left leg, but Kasanganay caught it with his left arm and held onto the leg.
That's when Buckley leaped into the air, spun around backward and nailed Kasanganay in the face with his right foot, managing to connect even though Kasanganay had his hand up to protect his face.
Kasanganay instantly had a blank look in his eyes and fell backward onto the mat.
Buckley said he had drilled that move in practice, but had never landed it in a bout until Saturday night.
UFC fans and commentators were in awe.
"I WANNA MARRY THIS KNOCKOUT AND HAVE ITS BABIES," tweeted Fernanda Prates, who writes about UFC for The Athletic. She added "I still don’t fully understand the physics of it" and didn't know how Buckley generated the power he did from that position.
Correction: An earlier version of this story incorrectly stated this happened at UFC 254. That event won't take place until Oct. 24.