I've been enjoying the game so far but I'm having trouble with the stunning mechanism when trying to stealth the game. I try crouching and slowly walking up to them from behind, but no matter what I do that always notice and I end up having to shoot my way out or die trying. Slow walking up to them also didn't work. The only method that seems to work for me is when I crouch towards from a distance and then suddenly running up to them smashing my mouse hoping it knocks them out and that's a 50/50 success rate. Is there any advice anyone here can give me or stealth tips?