In Zito defense (as much as i hate auto attack but that's MY personal opinion), it doesn't trigger when you're just in the VICINITY of a target, or if you're targeting, it only goes off after you use any offensive skill first. The fact that it is triggering his auto attack when he decoys has GOT to be a bug.
Why is it a bug you ask? Because 1) the prestige doesn't do that 2) blinding tuft/feathers doesn't do that 3) no thief stealth does that.
etc etc.