So I just got AoC the other day and have been playing a Ranger doing some open world pvp. Well I noticed that when you attack out of hiding you get the little cast bar and do a mezz shot which stuns the target basically until your next attack (or until they take damage, not too sure.) I use a xbow so all my attacks are slow, but I noticed that if you do the shot out of hiding, and then cancel it, the target still has the full 10 second stun. I've found it pretty useful when I want to position myself in pvp or maybe get a trap down in a more strategic location.
Not sure if it is intended and I don't think it is a re-post, checked other pages. Enjoy =)