Feline Escape is a Ranger utility power available at the 2nd level.
Feline Escape
Ranger Utility 2
You sidestep an attack as nimbly as your companion might.
Encounter ✦ beast, martial
Personal
Prerequisite: You must have a cat beast companion
Trigger: You are hit by an attack that targets AC or Reflex
Effect: You gain a +4 bonus to AC and Reflex until the end of your next turn. If the triggering attack misses you because of this bonus, you can shift a number of squares equal to your Wisdom modifier (minimum 1).