Stealth Kill Bugs

[(PSN)Klone72]

I have noticed a consistent bug with stealth kills. If an enemy has been put under a sleep effect the ability to stealth kill is either not prompted or not available. With Ivara i have had to sleep multiple times so i can one stike with heavy attacks only after the enemy is unaware of my presence to maintain the 500%  buff. This is a severe hinderance to the way this was intended to work. Sometimes it works as intended, most times its the heavy attack work around. Please look into this.