+ vision check
Enemies check your line of sight, + the consequences of your actions (i.e., they see the corpse). The corpse isn't just shown as a consequence of your actions, but as an object to which they will react. It can be hidden; this is a good example of how the game isn't just about click-clicks, but how connected it is.
Despite the above, I played and felt like I was in a Western, trying to figure out who's faster)