It's nothing to cut off just one arm of these disciples.
Their practice is that the weakest is also the level of half-step heaven and man, plus the Yuding Gate itself is the mainland of heaven and man, the most skilled in the treatment of the clan door, broken an arm, they have too many ways to recover.
So the punishment of cutting off one arm is more psychological.
Don't you think you are disciples of Yuding Gate, so you are above it? In that case, cut off your arms and dare not be so arrogant after seeing you.
Ye Dun dared to kill Zhao Xing and Manxue directly just...