lol
Thers some class you tube videos and stuff as regarding this trick...Infact there even kits you can buy or make yourself that includes a button / switch..!
I have seen in action and even had somebody I knew try it out on me to see if it worked - I had no idea and then, it was new so it didnt have a name. It is cheating and I hope that GG sort this little thing out - if you was caught doing this in a clan match - you'd seriously get your ass kicked... Serious cheater do this, and it sukx for everyone..!
If you don't know what the effect is, : well basically speaking, the enemy disappears in front of you, as if they have left the game or lost connection,,,,but they are still there, they can see you and shoot you. The difference between games is enough that you'l die and they'l live - pop back into the game and your back at respawn...!!
So yeah its a nasty cheat, and frowned apon by those in the know...
Hope that helps...?
maj