These should be added to increase realism IMO:
1. Conditions:
Leg hit, >50% of full hp
Effects:
50% knockdown risk
2. Conditions:
Leg hit, >75% of full hp
Effects:
Guaranteed Knockdown
3. Conditions:
Damage taken>Ironflesh+X(I would prefer X to be 0, but 3,4 or 5 might be necessary to add here)
Effects:
stun(not weapon stun, the staggered/slow stun)