Straight talk: we're not karate experts. We have no idea what the technical term is for this spinning, flipping, guillotine kick knockout. Just watch the video, no words are needed.
Eurosport fills in some of the details, if you're the type who needs context for your head-kicking. The event: the PPO Karate Championships in Ulyanovsk, Russia. The style: Shinkyokushin karate, which emphasizes "full contact fighting with no protective gear." The kicker: Semyon Moskalenko. The kickee: some poor schmo who can no longer remember his VK log-in.