You can take advantage of a well-placed blow to skirt around your foe.
Benefit: Whenever you score a critical hit with a melee attack, you can immediately make a 5-foot step as a free action, even if it’s not your turn (such as when you make a critical hit as an attack of opportunity). This does not count against your total movement for the round, nor against the number of 5-foot steps you can take.
The Genius Guide To: Feats of Critical Combat. Copyright 2010, Super Genius Games. Author: Owen K.C. Stephens