The below video shows a street fight between two guys in China - one of whom was MMAtrained.
The bigger one starts with pushing the smaller one around for a bit, and then swipes him off his feet. The two then engage random throws of punches and kicks, until the bigger guy attempts to deliver a kick to the other guy’s groin area.
The smaller guy uses the attempted nuts kick to his advantage and knocks the bigger guy down, delivering a follow up kick to the chin that makes the bigger guy tense up and violently convulse.
According to online reports, the larger man died of a brain hemorrhage.