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:[facebook url="https://www.facebook.com/brandonmc.ninja/videos/1047171445417445/"]And you can watch one of his complete matches in the video below (starts 13.00):[facebook url="https://www.facebook.com/KakutoChallenge/videos/1368816939861583/"]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: