Something pretty nasty went down in the kickboxing world this past weekend.

A fight between Murthel Groenhart and Harut Grigorian ended in a chaotic brawl that saw fans entering the ring to attack Groenhart.

The incident happened at Glory 42 in Paris. During mid fight, Grigorian stopped fighting for some odd reason and ignored one of the most important the rule: protect yourself at all times. Groenhart noticed that his opponent completely dropped his guard and turned his back which lead to Groenhart viciously knocking him out.

Immediately after the brutal KO, fans stormed the ring and started physically attacking Groenhart. After a short-lived scuffle things calmed down and the brawl ended.