Wyvern Wing (Combat)Source Legacy of Dragons pg. 21
Like a wyvern on the wing, you command a fluid style that enables you to make attacks while moving.
Prerequisites: Exotic Weapon Proficiency (whip), Wyvern Fury Style, Wyvern Sting, Acrobatics 10 ranks, brawler’s flurryACG class feature or flurry of blows class feature.
Benefit: While using the Wyvern Style feat, if you use flurry of blows or brawler’s flurry and take a 5-foot step, you can take an additional 5-foot step. You can take this extra 5-foot step only between two attacks in your flurry, but you can take both your 5-foot steps consecutively without making an attack between them.