Are you completely invisible to enemies? They don't even seem to see you run right in front of them?
Nice but some hack, it must be, for you never to be noticed when there lookin right at u and ur moving.
your over estimating the average players ability to do a double take on what looks like a dead body at a glance, i used to use a similar tactic on bf2, players understand the flow of gameplay and where the fightings at, if you go against the grain with tactics like this people generally dont realise straight away
edit: even when moving if your in an area that the player has considered a tempory safe zone they often presume your an ally for a split second