Reason:
For dexplayers with cloths and light armor (kip-up) it can be a fun challenge to fight NPC with knockdown. Same goes for strength dps builds (mostly orcs/earth-genasis) that have a chance to resist it.
This leaves us heavy fullplate tanks on the floor.
It might look hilarious when the tank is surrounded by four giants and just lay on the ground unable to do anything until the rest of the group kills them. But playwise its not.
Dont get me wrong, I do like that knockdown and disarm is implemented for the npc. It gives flavor and interesting encounters.
My suggestion is therefore to implement the feat Stability from DnD 3.5
DnD 3.5 Comparison (from BGTSCC wiki of the race Shield Dwarf/Gold Dwarf)
- The racial feat stability has been excluded: A dwarf gains a +4 bonus on ability checks made to resist being bull rushed or tripped (see knockdown) when standing on the ground (but not when climbing, flying, riding, or otherwise not standing firmly on the ground).