Warning: Graphic images below
UFC middleweight Chris Weidman has suffered a disturbing leg break in his bout against Uriah Hall.
Fighting on the main card of UFC 261 in Florida, Weidman snapped his leg near the ankle, as his calf kick - the first strike of the fight - was checked by Hall, drawing a collective gasp from the capacity crowd at Jacksonville.
The arena sat in stunned silence, as Weidman reeled in pain, Hall kneeling in front of his cornermen and unable to look back at his opponent.
The former middleweight world champion was stretchered out by medics and taken straight to hospital.
The injury was arguably the worst seen in the Octagon, since Anderson Silva broke his leg in eerily similar fashion in his rematch against - ironically - Weidman back in 2013.
The contest was ruled a TKO win for Hall, coming just 17 seconds into the bout.
Hall expressed his sympathy for Weidman in a sombre post-fight interview.
"I've got nothing but respect for Chris Weidman, he's truly one of the best," says Hall.
"It's a crazy story that he was the first man I fought that defeated me. He introduced me to fear.
"I didn't know what fear was - I was scared of wrestling. We went down different paths.
"He was the first one who defeated Anderson, I was the last.
"It's the sucky part of the sport, it's the hurt business. I've nothing bad to say about him, I hope he recovers and whatever rank I am, if he gets well, I owe him this fight."
UFC president Dana White has tweeted that Hall became the first fighter to win a bout without throwing a single strike.
He included a video of the incident in his post, which you can watch at your own discretion below.