"I defeated Earl Shi three years ago, there's no reason I shouldn't be able to beat Gyou’Un and Bananji!!"
Gyou’Un was a 3GH’s sword, offensively he is 3GH level. For him to draw with Ouhon like that is fine.
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Although if we want to be technical, Ouhon took Gyou’Un’s dominant arm while Gyou’Un did nothing permanent to him in return.