Game Mechanics: Rooted mobs being treated like a mezed mob by pet

[guineapig]

Alright, granted (although I still think a chanter pet should be different.)

But my main point is that my animation will not attack a rooted mob until I get hit again by it. (I can assure you that the rooted mob did indeed deal damage to me before I rooted it in all instances).

Basic scenario:

2 mobs hit me
pet tanks one
I root the other.
Pet finishes off mob
Pet returns to me as if mob #2 didn't even exist.

This is exactly how pets act towards mezzed mobs on live.

What should happen is that when pet finishes off one mob it should then go attack and taunt the rooted mob. Can anyone else confirm that this is happening to them so I don't start feeling like a crazy person?