I do not believe the monk disciplines SilentFist and AshenHand are working as intended.
SilentFist is supposed to have a chance to stun your opponent, but I think this ability is absent from P99, based on my countless uses of this discipline for testing purposes.
Likewise, AshenHand is supposed to come with a chance to outright kill your target, but again, I have never had that happen, although admittedly I have used this discipline far less given its refresh timer.
My source is page 184 of Prima's Official Ruins of Kunark guide (published in 2000):
https://www.scribd.com/doc/53542242/...fficial-eGuide