Your small size lets you quickly duck out of sight.
Prerequisites: Dex 13, Small size or smaller.
Benefit: During the first round of combat, flat-footed opponents are considered not to have noticed you yet for the purposes of Stealth skill checks, allowing you to make a Stealth check that round to hide from them.
Advanced Player’s Guide. Copyright 2010, Paizo Publishing, LLC; Author: Jason Bulmahn.