Just finished the game. Loved it. Gonna play it again to get kills in all kinds of ways.
Funny thing happened on the last mission though. I subdued a guard and went and stuck him in a hiding place and went in search of my next target. Knocked out that guard and dragged him to the place I had hidden the first one. Pressed "Y" to hide him and realized I hid the first guy in a damn mulcher.
All of a sudden, I get negative points for killing a non-target. Didn't know wtf was going on until I saw the blood and guts spray out.