At some point muters gained the ability to do a 'where' while duo. I know it doesn't always work, but you just spam it until it does. Last time I played a serious muter, you could not do a 'where' at all while duo. I'm not sure why the change was made, but it allows them to hunt and never risk coming vis. If they lost that one perk, it would be a very different ballgame. Like the days of old, if you wanted to see if your victim was in an area, vis....lag....where, c duo.