On Sunday, American MMA fighter Justin Barry, 33, made his debut inside the ring and landed a rarely-seen knockout that left his opponent's body stiff and unresponsive.

The fight happened at the Cage Warriors 130 event in San Diego, California, a leading European-based mixed martial arts promotion that has expanded into the US.

Barry battled against Alan Benson, a fellow American fighter in a 195-pound catchweight session, the second of eight fights to occur that night.

Barry ferociously completed the match as he knocked Benson's senses out of whack with an inside crescent kick halfway through the second round.

The kick, which was thrown with precision, landed extremely hard on the side of Benson's jaw, to the point that it knocked him out cold before he touched the ground.

The impact of the strike could be seen on the canvas as Benson's body tensed.

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As Benson was beaten to a state of unconsciousness, Mike Beltran, the referee, rushed over to end the fight at the right moment so that Benson wouldn't endure any other punishments.

Check it out here.

Barry's technique advanced his pro-MMA record to one win (one knockout) against no draws and defeats.

Once social media saw the playback of the knockout move, they couldn't help but make references to the matrix and witchcraft.

"You know a sport evolved when Matrix moves are starting to hit," someone wrote.

"What in the witchcraft technique was that?! Look how that landed! Mad!" wrote Dominique Wooding, a CageWarriors Bantamweight World Champion.

Someone else drew references to their experience with karate, noting that the inside crescent kick was known as "an inverted roundhouse kick."

"When I did karate as a teenager, this move was called an inverted roundhouse kick. Anyone else taught the same…?" they said.

Check out some other responses below.

It's still up in the air as to when Barry will fight again. But if and when he decides to, it's probable that more eyes will be watching to see what other moves he has up his sleeve, or in this case, his leg.

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