Knockdown Critical

Knockdown Critical
Basic Physical Maneuver [General]
Prerequisites: Physical Rank 4
Free Action
Trigger: You roll a Critical Strike on a weapon attack.
Target: The creature subject to your critical strike
Effect: Your powerful strike lands on your target's unstable limb, causing them to falter. In additional to the effects of the triggering attack, if the target is your size or smaller it is also automatically knocked Prone.
Special: Abilities that cause you to automatically Critical Strike (such as Backstab) do not qualify for use of this power.
Master Augment, Toppling Critical
[Physical Rank 6]
Effect: You may affect a creature one size category larger.