I know there is a bug where the ability doesn't unlock at all but I've unlocked Man's best friend and its lvl 2 upgrade but I cannot use the ability at all. No matter what, the ability stays greyed out. I know you have to aim at an enemy but it never lights up when I do. I've tried using it while undetected, during a fight, and when locked onto an enemy. Nothing will cause it to light up so I can actually activate it. Am I missing something?