Imagine this scenario - the holy Sweeper Monk suddenly wants to kill Wang Yuyan (oops... no disrespect to Mr. Sweeper Monk, its just a scenario ). Duan Yu, would definitely come out to protect and defend Wang Yuyan with all that he have. Threatening to harm Wang Yuyan is probably the only way to force Duan Yu into a real fight.
Now with the help of Wang Yuyan advising Duan Yu on the use of Beiming Shengong and Lingbo Weibu during the duel with Sweeper Monk, does Duan Yu stand a chance against the powerful Sweeper Monk?
And of course 6 Mai Shen Jian, can Sweeper Monk escape from it?