Enemies are not always alerted to your existence right away. You will be taught in game how to use sneak attacks. You must crouch with and press on an enemy whom is unaware of you. This will result in an instant kill. They are aware if their eyes are red. Yellow means they are alert and you should back away. At first this can be very frustrating as enemies seem to always turn around at the last second or have very hard to read movements. So instead, sprint towards them with and right as you close in, do the sneak attack. They'll likely be turning in your direction, and may even be facing you, but as long as the eyes are not red you will get the kill.
Note: Not all enemies can be killed this way.
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