When you kill a mob that gives exp or honor, it does not heal you. I tried both demo and destro. Doesn’t heal demo when in demon form, and doesn’t heal destro when killing a mob with chaos bolt. Was on a leveling character, level 73.
What enemy are you killing? Just killed someone in PvP and got it to activate off Chaos Bolt.
Also killed a level 69 as level 73 and got it to activate as well.
Going to need more information
I noticed it not working on ogres in nagrand, and then just everything in 68-75 northrend zones I killed that gave exp, I tried it again in Hyjal and it worked so I dunno.
It randomly stopped working, I logged out and back in and seems to work again for awhile.