Doing the Kingfisher mission, the one with Sam Fisher, and while it says you can't kill anybody it fails me when I knock them out! I grab a Unidad, hustle him off into a bush, Right Click to K.O. and I immediately get 'Target Killed. Mission Failed' Is this a bug or no?
You're not allowed to kill anybody. Breaking their Necks probably counts as "killing". You have to get to Sam completely unseen without Enemy Contact.
Yes, can't kill, can't even whisper sweet nothings into their ear... the fun will begin when they script the "Hell will Break Loose Now" firefight.