Khabib Nurmagomedov was known to unleash brutal headbutts when they were legal in competition.
The undefeated Russian fighter used his head on a number of occasions in the early days of his career, especially in 2010, when he faced Ali Bagov at the Golden Fist Russia event in Moscow.
As you can see in the below footage, "The Eagle" uses his familiar grappling style to send his opponent to the mat, before using his head as a battering ram.
The UFC operated with a limited rule set in the early 1990s and hair pulling, groin strikes and headbutting were allowed until years later.
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In terms of the fight, Khabib eventually won by unanimous decision and extended his unbeaten record to 8-0 after showcasing his unorthodox head movements.
The Russian, as we all know, remained unbeaten in the UFC after bouts against the likes of Conor McGregor, Edson Barboza and Dustin Poirier.
Imagine getting hit by one of those headbutts - or even a punch - from Nurmagomedov.
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Well, the former UFC lightweight champion unleashed a swift right when this brave fan wanted to feel the power of the Dagestani destroyer in the form of a body punch to the stomach.
Needless to say, he immediately regretted his decision.
At the time, the undefeated Nurmagomedov was sitting on the sideline as he nursed an injury.
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A botched weight cut prevented him from competing for the interim lightweight against Tony Ferguson at UFC 209, and while the 31-year-old continued to train ahead of his anticipated return, he was clearly having some fun in the meantime.
The pair did hug it out at the end of the clip but seriously, that must have hurt.
Thoughts on the early footage of Khabib using headbutts?
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Let us know in the comments.
Featured Image Credit: YouTubeTopics: Khabib Nurmagomedov, SPORT, UFC, MMA, Russia