maybe bcoz of Guard skill...
even though i only come in pvp sometimes, i always fight with bunnies..
and base on my experience, my aura shatter also often miss..
unlike when im using it against other characters (ex. mage w/ shield of heaven) that usually works...
even my normal hit miss alot in guard.. o.o
an alternative in breaking through Guard is use Fist full of galders skill (hits 4 times)..
actually, someone just told me this before.. and its actually helpful