deathwalker ability bug
If deathwalker doesn't die when it's ability is active, then the 7.5 cooldown (half the normal cooldown because of the ongoing modifier) runs twice. So the overall ability cooldown is still 15 seconds. I'm not counting ability implants. I don't know if there is any similar behavior with implants without the ability cooldown modifier (I learned of this problem today itself).
Is this by design or a bug?
