The actions of one black belt has divided opinion among the members of the grappling community. 

ADCC Trials and EBI veteran Daniel O'Brien donned a blindfold at the recent Kakuto Challenge, a tournament in the South East region, and won a number of no-gi matches!

A coach at Triad Martial Arts Academy in Cullman, Alabama, O'Brien is a talented no-gi grappler who took silver at the ADCC 2016 North American Trials and made it through to the semifinals of the light heavyweight EBI. 

See a clip of O'Brien in action versus a brown belt here: 
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And you can watch one of his complete matches in the video below (starts 13.00): 
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This isn't something new for O'Brien -- you can watch him practicing footlock defenses while wearing a blindfold in this video: 

We've got a bunch of Daniel O'Brien's matches from the ADCC 2016 North American East Coast Trials, which you can watch here: 
• Daniel O'Brien ADCC matches