I've got NVG's now but I took them off of a guy I killed. It's all about out manouvering them and keeping hard cover between you adn them staying low that kind of thing. Don't forget if you're in an area infested with dead alot of the time the guy with NVG's probably won't open fire as he's going to draw the attention of alot of not-so-dead! Also You'll tend to find that alot of players with NVG's have been playing a while adn the more experianced players will tend not to shoot people on site. This isn't true 100% of the time of course....