Thats how its always worked.  Been all about timing and server ticks. 
 
 
Seems to be working as intended.  It can even work with melee rounds.  The split second after a charm breaks if a mob was actively attacking your pet it can get a round in and they will fight once they lose their hate for you. 
 
By that same token, I've seen mezzes broken with damageshields, where a mezzed mob will get 1 swing off the split second after getting mezzed then the DS he takes from hitting a tank or chanter breaks the mez.  Which is always awesome to laugh at. 
		
		
		
		
		
		
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