I have been using Endless Fury, the morph/upgrade to Mage's Fury that is supposed to return mana when it kills the target. It doesn't seem to be working. Currently the ability costs 48 mana, and is supposed to return 41, so it should break pretty much even. However I don't seem to be getting the mana return. If I do a fight, and the only ability I use is Endless Fury once, and it triggers and kills the mob, then I should end up with almost full mana. This isn't happening.
Anyone else having issues with this skill? Am I misinterpreting the description somehow?