It was a spinning back heel kick from Vitor Belfort delivered to the side of the head belonging to Luke Rockhold.

It was rather impressive.

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And it was yet another first-round knockout for Belfort, who won in his native Brazil on Saturday night at UFC on FX 8.

Watch the knockout below. (Scroll to around the three-minute mark if you're not into the recap of the previous bouts on the main card, include Jacare Souza's first-round stoppage over Chris Camozzi.