Well I had a glance at the target bar while doing the world shaman quest last night and I saw that it was down to 20% at one point so I am guessing it is going down but maybe the update isn't as fast as you were expecting if it looks like it isn't working for you.
I would say periodically during a fight do some screen shots and see afterwards whether in fact it is going down. And hopefully matching the hud percentage at least
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