Here's what happen with that bug, as long as you can "cast it" which means you're not being disturbed, not fizzling it, you get to do the damage, without finishing the round.
You just use it, target whoever you want, and when the heal comes up, you press escape. That's it. Your damage is done, you canceled your heal, and now you're back at "deciding what I want to do this round".
So you get free damage, and the skill is not in cooldown, and the round did not pass.
Hope you can fix it ! I saw nothing on my search, so it might not be found / abused, but now that it's posted, who knows !!!!

Keep me updated on it !
