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The two middleweights were half way through round 2 of their fight on the prelims of UFC Fight Night: Mores vs Sandhagen on Saturday night when Buckley ended the fight with a shot of a lifetime.
Kasanganay caught his opponents foot but Buckley responded with a spinning heel kick right to 26-year-old's mush!
There's now some extra angles showing just how incredible the shot was and you can really see loser's eyes roll into the back of his head.
The loss handed Kasanganay his first defeat in the octagon and after the fight he was very humble in defeat. He took to Instagram and posted a picture of himself along with the caption, "God bless you. It was an honor to step in the Octagon with you and to do what I love. Safe travels to you and your team Beautiful shot. Way to fight."
Unsurprisingly Buckley, who moved to 11-3 with the win, picked up a $50,000 bonus for performance of the night.
The winner was being interviewed after his win when he was interrupted by UFC president Dana White who said the KO was something "no one had ever seen anything like" before.
It was a truly incredible night for Buckley and it's a shot no one will be forgetting in a hurry.
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