I'm not defending this guy by saying he doesn't wall hack or that he isn't a hacker but... you gotta figure if the person that is complaining is running around the map or zooms in or switches weapons it is very possible to hear those sounds which if your smart with the map there can only be so many places to look... also when i hear sounds i look at the walls and wait for them to make another sound because like insaen i have a good headset. (just saying)