If you attack a player, you are in combat (grey for that player), and can no longer use guards to defend yourself (vs that player)...
So, what do you want to tell? That blue players are using Guard Zone to avoid being ganked?
So all you want to do in pvp is gank?
Play a month on baja at yew gate then tell me what he is talking about. there is a large tram guild that does nothing but stay in the gz tell they have about 50 to 1 odds then they all come running out destroy one person and all bounce back to the guard zone for another hour or two... there are no fights, just stupid little skirmishes that result in nothing..